KR101516194B1 - Digital Goniometer - Google Patents

Digital Goniometer Download PDF

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Publication number
KR101516194B1
KR101516194B1 KR1020140055269A KR20140055269A KR101516194B1 KR 101516194 B1 KR101516194 B1 KR 101516194B1 KR 1020140055269 A KR1020140055269 A KR 1020140055269A KR 20140055269 A KR20140055269 A KR 20140055269A KR 101516194 B1 KR101516194 B1 KR 101516194B1
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KR
South Korea
Prior art keywords
circle
housing
circumference
length
tape measure
Prior art date
Application number
KR1020140055269A
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Korean (ko)
Inventor
박상은
Original Assignee
삼성중공업 주식회사
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Priority to KR1020140055269A priority Critical patent/KR101516194B1/en
Application granted granted Critical
Publication of KR101516194B1 publication Critical patent/KR101516194B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
    • G01B21/24—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes for testing alignment of axes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/20—Slide gauges
    • G01B3/205—Slide gauges provided with a counter for digital indication of the measured dimension
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
    • G01B5/12—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters internal diameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
    • G01B5/201—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring roundness

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tape Measures (AREA)

Abstract

A digital goniometer is provided. The digital goniometer comprises: a housing; a tape measure buried inside the housing to be extended from the housing in order to measure the circumference of a circle; a calculation part installed inside the housing to calculate the arc length of the circle with the input of the central angle of the circle and the central angle of the circle with the input of the arc length of the circle based on the measured circumference; a digital panel formed on the housing to output one or more among the central angle and the arc length of the circle; and a power supply part to supply power to the digital panel.

Description

Digital Goniometer

The present invention relates to a digital goniometer.

In the construction and construction sites, there are many structures having the shape of cylinders, cylinders and spheres. It is difficult to know the central angle of the circle forming the cross section of the structure directly on the surface of the structure when the equipment or the like is applied to such a structure.

However, there is a lot of work in accordance with this central angle because designing the structure through the central angle of the circle at the time of design and planning the construction based on the design. In this case, a device for measuring the central angle was used to determine the central angle by measuring the curved surface itself by a sensor, or to fix the device with two legs, and to determine the angle using a probe therebetween.

However, the method of measuring the curved surface itself by the sensor requires a large amount of calculation, and the angle determining apparatus having the leg has a limitation that it is difficult to measure the circumference of a certain size or more.

Korean Patent Publication No. 10-2005-0072657

A problem to be solved by the present invention is to provide a digital goniometer which can know the central angle of a circle with a simple structure.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a digital goniometer comprising: a housing; a tape measure embedded in the housing and extending from the housing to measure a circumference of the circle; Calculating a center angle of the circle when the center angle of the circle is inputted and calculating a length of the circle when the center angle of the circle is inputted and calculating a center angle of the circle when the length of the arc is inputted; And a power supply unit for supplying power to the digital panel.

Wherein the digital panel directly receives at least one of the circumference and the diameter of the circle and the arithmetic unit calculates the length of the arc when the center angle of the circle is input based on at least one of the input circumference and the diameter, When the length of the arc is input, the center angle of the circle can be calculated.

The tape measure may include an extended end portion extending to the outside of the housing and a fixed end portion fixed to the inside of the housing, and the housing may include a joint fixing portion to which the extending end portion is coupled.

The digital panel may receive an extension length of the tape measure when the extension end is coupled to the coupling fixture.

The locus along which the tape measure is extended can be formed on one plane.

According to another aspect of the present invention, there is provided a digital goniometer comprising: a stringer including a tape measure embedded in a wound state;

A calculator for calculating a length of the arc when the center angle of the circle is inputted based on the circumference and calculating a center angle of the circle when the length of the arc is inputted; A digital panel for outputting the calculated center angle of the circle or the length of the arc, and a power supply for supplying power to the digital panel.

The power source unit may supply power using an external power source or a battery.

The tape measure may include an opening for extending the tape measure to the outside and a joint fixing unit for fixing the tape measure by being coupled with one end of the tape measure extending to the outside.

The engaging and fixing portion may be located on at least one of both sides of the opening.

1 is an exemplary perspective view of a cylindrical structure in which a digital goniometer is used in accordance with an embodiment of the present invention.
2 is a plan view of the cylindrical structure of FIG.
3 is a plan view for explaining a digital goniometer in accordance with an embodiment of the present invention.
4 is a front view for explaining a digital goniometer in accordance with an embodiment of the present invention.
5 is an exemplary perspective view illustrating a method for using a digital goniometer in a cylindrical structure according to an embodiment of the present invention.
6 is an exemplary plan view illustrating a method of using a digital goniometer in a cylindrical structure according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. The relative sizes of layers and regions in the figures may be exaggerated for clarity of illustration. Like reference numerals refer to like elements throughout the specification.

Like reference numerals refer to like elements throughout the specification. "And / or" include each and every combination of one or more of the mentioned items.

It is to be understood that when an element or layer is referred to as being "on" or " on "of another element or layer, All included. On the other hand, a device being referred to as "directly on" or "directly above " indicates that no other device or layer is interposed in between.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be the second element, the second element or the second section within the technical spirit of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

1 and 2, a structure in which a digital goniometer according to an embodiment of the present invention is used will be described.

1 is an exemplary perspective view of a cylindrical structure in which a digital goniometer is used in accordance with an embodiment of the present invention. Figure 2 is a plan view of the cylindrical structure of Figure 1

1 and 2, a cross section of the structure 100 in which a digital goniometer according to an embodiment of the present invention is used may be circular. For example, a cylinder or a sphere. Although not limited thereto, as shown in Figs. 1 and 2, for simplicity of explanation, the structure 100 will be described as a cylinder.

The structure 100 may have a cylindrical shape, and may be a shape widely used for a column of a building or the like. The cross section of the structure 100 may be a circle. The center angle? Of the circle can be obtained from the cross section of the structure 100 using a goniometer or the like. However, there may be a structure 100 in which a cross section is not exposed at a construction site. In this case, the central angle [theta] of the structure 100 can not be measured, and the corresponding position on the surface of the structure 100 along the central angle [theta] is unknown.

Therefore, in order to know this, the curved surface profile is measured by measuring the curved surface as an image, or the angle finder having two legs is used. However, the method of measuring the curved surface profile requires a device that processes a large amount of computation quickly, The angle finder has a disadvantage that the size of the angle finder must be increased as the circumference becomes larger.

In contrast, the digital goniometer 200 according to the embodiment of the present invention can measure the central angle? Easily and simply for the structure 100 in which the end face is not exposed.

Referring to Figs. 1 to 6, a digital goniometer according to an embodiment of the present invention will be described.

FIG. 3 is a plan view for explaining a digital goniometer according to an embodiment of the present invention, and FIG. 4 is a front view for explaining a digital goniometer according to an embodiment of the present invention. FIG. 5 is an exemplary perspective view illustrating a method of using a digital goniometer in a cylindrical structure according to an embodiment of the present invention, and FIG. 6 is a method of using a digital goniometer in a cylindrical structure according to an embodiment of the present invention. Is an exemplary plan view for explaining.

1 to 6, a digital goniometer 200 according to an embodiment of the present invention includes a housing 210, a digital panel 220, a power source 240, and a tape measure 230.

The housing 210 may take the form of a digital goniometer 200 according to one embodiment of the present invention. The housing 210 can house the digital panel 220, the power supply unit 240, and the tape measure 230. However, the present invention is not limited thereto. That is, the digital panel 220, the power supply unit 240, and the tape measure 230 are located outside the housing 210, and may be simply connected to the housing 210.

The housing 210 may have various shapes. The housing 210 can receive the tape measure 230 therein. In addition, the housing 210 can accommodate the power supply unit 240 therein. Thus, the housing 210 may preferably be a three-dimensional shape having a space therein.

The housing 210 may be provided with a digital panel 220 on one side thereof. Thus, at least one side of the housing 210 can be flat. However, the present invention is not limited thereto, and may include a surface having a concave or convex curvature to such an extent that the digital panel 220 can be installed.

The digital panel 220 may be formed on the outer surface of the housing 210. However, the present invention is not limited thereto and may be installed inside the housing 210. In this case, the digital panel 220 can be exposed by opening the housing. That is, if it can be formed on one side of the housing, the shape of the housing 210 and the position of the digital panel 220 are not limited.

The digital panel 220 can input numerical values. The digital panel 220 may be a button-type panel that is pressed when a pressure is applied. However, the present invention is not limited to this, and may be an input device such as a touch screen. That is, all the usual ways of entering numerical values can be applied.

 The digital panel 220 may input at least one of circumference, arc, diameter, or angle. The numerical input method of the digital panel 220 may be a numeric pad or may be a method of inputting a numerical value by increasing or decreasing the number indicated by an arrow. However, the present invention is not limited thereto.

The digital panel 220 can output numerical values. The digital panel 220 may include a screen for displaying numbers. Such a screen may be a liquid crystal display. It may also be a touch screen. The configuration of this screen is not limited as long as it can output numerical values. That is, any common method of outputting a numerical value can be applied.

The circumference or diameter may be input to the digital panel 220. [ In this case, the digital goniometer 200 according to an embodiment of the present invention can output the length of the arc to the digital panel 220 according to the central angle [theta] of the circle of the circumference or diameter. In this case, the center angle? Of the circle can be obtained without using the tape measure 230. However, even in this case, the corresponding position of the central angle [theta] can be found along the scale of the tape measure around the tape measure on the surface of the structure 100. [ Also, when the circumference is measured by the tape measure 230, the digital panel 220 may output the length of the arc along the center angle? Of the circle using the measured circumference.

The digital panel 220 may include an on / off reset button portion 222, a circumference / call display portion 224, a diameter / center angle display portion 226, and an up / down button portion 228.

The on-off reset button unit 222 may include an on-off button and a reset button. When the on / off button is pressed once, the digital goniometer 200 according to the embodiment of the present invention is turned on and the digital goniometer 200 according to the embodiment of the present invention can be turned off once again. This on / off button can effectively manage the consumption of the power source 240 of the digital goniometer 200 according to an embodiment of the present invention.

The reset button can be used to input another circumference or diameter again when the circumference or diameter is inputted to the digital panel 220, or to measure the circumference again by measuring the circumference (230). The Reset button can reset the values already entered or measured.

The circumference / call display unit 224 includes a circumference display unit for displaying the circumference and a call display unit for displaying the call. Of the circumference / call display section 224, the circumference display section can display the inputted circumference. Or the circumference measured by the tape measure 230 may be displayed. Or when the diameter of the circle is input to the diameter display section, the circumference corresponding to the diameter of the circle is calculated by the calculation section, and this value can be displayed on the column display section.

The call display unit can display the length of the inputted call. In this case, the arithmetic unit may convert the length of the arc to the central angle of the circle by the diameter of the circumference or circle, and display the converted value on the central angle display unit. Conversely, when a center angle of a circle is input, the arithmetic unit can convert the center angle into a length of the arc by the diameter of the circumference or circle, and display the arc length on the call display unit.

The diameter / central angle display section 226 includes a diameter display section for displaying the diameter of the circle and a central angle display section for displaying the center angle of the circle. The diameter display portion of the diameter / central angle display portion 226 can display the diameter of the inputted circle. Alternatively, when the circumference is input to the circumference display unit instead of the diameter of the circle, the diameter of the circle along the circumference can be calculated by the calculation unit and displayed on the diameter display unit. Alternatively, the diameter of the circle according to the circumference measured by the tape measure 230 may be calculated by the arithmetic unit and displayed on the diameter display unit.

The center-angle display unit can display the center angle of the input circle. In this case, the center angle of the circle is converted into the length of the arc by the circumference measured by the input circumference, circle diameter or the tape measure 230 in the operation unit, and can be displayed in the call display unit. Alternatively, when the length of the arc is inputted, the length of the arc is converted into the center angle of the circle based on the circumference, the diameter of the circle or the circumference measured by the tape measure 230 inputted by the arithmetic unit, .

Up and down buttons 228 can be used to input the circumference, arc, diameter, and central angle. The up and down buttons 228 include an up button and a down button. When the up button is pressed, the numerical value is increased. When the down button is pressed, the numerical value can be decreased.

The button configuration of the digital panel 220 is merely exemplary. In other words, any input method can be used as long as it can input numerical values. For example, it is possible to include a numeric pad having numbers from 0 to 9, or a virtual keyboard on a touch pad. That is, it is not particularly limited.

The power supply unit 240 may supply power to the digital panel 220. The power supply unit 240 may be a battery. However, the present invention is not limited thereto. The power supply unit 240 may be a part connected to an external power supply. That is, it may be a port connected to an external power source or an electronic device by a cable, or may be in the form of a coil supplied with power wirelessly. That is, the power supply unit 240 can supply power to the digital panel 220 without any restriction.

The power supply unit 240 may be housed inside the housing 210. When the power source unit 240 is a battery, the power source unit 240 can be accommodated in the housing 210. When the power supply unit 240 is connected to an external power supply, the power supply unit 240 may include a port for connection with an external power supply. Of course, the power supply unit 240 may include both a battery and a port.

The tape measure 230 may be received within the housing 210. However, the present invention is not limited thereto, and may exist outside the housing 210. In this case, however, one end of the tape measure 230 should be fixed to the housing 210. When the tape measure 230 is received in the interior of the housing 210, the housing 210 may include a tape measure 250 to receive the tape measure 230. The tape measure 230 includes a fixed end fixed to the stringer portion 250 and an outwardly extending extension 232 of the stringer portion 250. [

The stem portion 250 may include an opening 252 through which the extension end 232 of the tape measure 230 extends. The tape measure 230 may extend outwardly through the opening 252. The tape measure 230 may extend outwardly of the strap portion 250 by an external force in a wound state. At this time, the tape measure 230 can be restored to its rewound state when the external force is lost.

The housing 210 may include an engagement fixture 212 to which the extension end 232 of the tape measure 230 is coupled. The mating fixture 212 can be engaged with the extended end 232. Any shape can be used as long as the joint fixing portion 212 can engage with the extending end portion 232. That is, it is not particularly limited. The mating fixture 212 may be, for example, in the shape of a groove into which the extended end 232 is fitted. The joint fixing part 212 may be located on at least one of both sides of the opening 252 of the housing 210. Therefore, when the coupling portion 212 is provided on only one side of the opening 252, the circumference can be measured to the side where the coupling portion 212 is provided. However, when the joint fixing portion 212 is on both sides of the opening 252, the tape measure can measure the circumference in either direction.

The tape measure 230 may extend outside the housing 210 to surround the circumference and may be coupled to the coupling fixture 212. The locus along which the tape measure 230 extends can be formed on one plane. The plane may be a plane including a circumference. That is, the tape measure 230 can be bent in the plane, but can not be bent out of the plane.

The tape measure 230 extends to the outside of the housing 210 so that the extension end 232 of the tape measure 230 surrounds the circumference of the structure 100 when measuring the circumference of the structure 100, 212 < / RTI > The digital goniometer 200 according to an embodiment of the present invention senses the extension length of the tape measure 230 when the extension end 232 of the tape measure 230 is coupled to the engagement fixing part 212, Can be displayed. The extension length may be the length of the tape measure 230 exposed to the outside through the opening 252 of the housing 210.

The computing unit may be located inside the housing 210. The arithmetic unit may be a part of a processor capable of arithmetic operation. For example, the operation unit may be a central processing unit (CPU) used in a computer or the like.

The calculation unit may calculate the length of the arc based on the circumference measured by the tape measure 230 when the center angle of the circle is input. The calculation unit may calculate the length of the arc based on the circumference measured by the tape measure 230 when the center angle of the circle is input. When the length of the arc is inputted based on the circumference measured by the tape measure 230, the center angle of the circle can be calculated. That is, the operation unit can convert the center angle of the circle and the length of the arc into each other.

The computing unit may also perform the transformation based on the circumference measured by the tape measure 230, as well as the diameter of the circumference or circle entered by the digital panel 220. That is, the arithmetic unit can calculate the length of the arc when the center angle of the circle is inputted, based on the diameter of the circle or the circle inputted by the digital panel 220. The arithmetic unit may calculate the center angle of the circle when the length of the arc is inputted based on the diameter of the circle or the circle inputted by the digital panel 220. [

When the circumference is input to the digital panel 220, the computing unit can convert the center angle of the circle and the length of the arc into each other. That is, since the circumference is the length of the arc when the central angle [theta] is 360 degrees, the center angle [theta] of the circle and the length of the arc can be converted to each other by proportional expression. Even when the diameter is inputted to the digital panel 220, the circumference is (diameter) *?, And thus the value of the circumference can be calculated.

That is, the length of the arc is (circumference) * (center angle of circle) / (360 degrees), and the center angle of the circle is (360 degrees) * (arc length) / (circumference). The calculation unit can calculate the arc length or the central angle of the circle by using the proportional expression described above.

The operation unit may transmit the calculated arc length or the central angle of the circle to the digital panel 220. The digital panel 220 may display the length of the received call or the central angle of the circle.

If the length of the arc or the center angle of the circle is displayed in the digital goniometer 200 according to the embodiment of the present invention, The length of the arc, that is, the position.

Accordingly, the digital goniometer 200 according to an embodiment of the present invention easily finds the position of the surface of the structure 100 corresponding to the central angle? . Also, since the digital goniometer 200 according to the embodiment of the present invention uses the tape measure 230, the digital goniometer 200 of the present embodiment does not need to be large even if the size of the structure 100 is increased. The length of the tape measure 230 is extended. Therefore, the digital goniometer 200 according to an embodiment of the present invention can easily find the length of the arc according to the measured central angle [theta] by measuring the circumference while carrying it easily.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: Structure 200: Digital goniometer
210: housing 220: digital panel
230: tape measure 240: power source part

Claims (5)

housing;
A tape measure embedded in the housing and extending from the housing to measure the circumference of the circle;
A calculator installed in the housing and calculating the length of the original arc when the center angle of the circle is input based on the measured circumference and calculating the center angle of the circle when the length of the arc is input;
A digital panel formed in the housing, the digital panel outputting at least one of a calculated central angle of the circle and a length of the arc; And
And a power unit for supplying power to the digital panel. The method according to claim 1,
Wherein the digital panel directly receives at least one of a circumference and a diameter of the circle,
Wherein the arithmetic unit calculates the length of the arc when the center angle of the circle is inputted based on at least one of the input circumference and the diameter and calculates the center angle of the circle when the length of the arc is inputted. The method according to claim 1,
Wherein the tape measure comprises an extension end extending outwardly of the housing,
And a fixed end fixed to the inside of the housing,
Wherein the housing includes a coupling fixture to which the extension end is coupled. The method of claim 3,
Wherein the digital panel receives the extension length of the tape measure when the extension end is coupled to the coupling fixture into the circumference. The method according to claim 1,
Wherein the trajectory of the tape measure is formed on one plane.
KR1020140055269A 2014-05-09 2014-05-09 Digital Goniometer KR101516194B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200490100Y1 (en) 2018-03-20 2019-09-25 두산중공업 주식회사 Cradle device for precise angle measurement
KR102519405B1 (en) * 2022-09-19 2023-04-06 김균식 Portable digital tiltmeter capable of bluetooth communication without an externally protruding antenna

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0579414U (en) * 1991-07-19 1993-10-29 日立電線株式会社 Curvature radius measuring device
JPH0666550A (en) * 1992-08-18 1994-03-08 Chuo Denshi Kk Method and device for measuring outer diameter of cylinder
KR100545345B1 (en) * 2003-08-13 2006-01-24 주식회사 에이치오엔 Digital outside diameter and method for controlling thereof
KR100679557B1 (en) * 2004-03-26 2007-02-06 스미토모 고무 고교 가부시키가이샤 Apparatus and method for measuring peripheral surface of mould for forming tire mould

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0579414U (en) * 1991-07-19 1993-10-29 日立電線株式会社 Curvature radius measuring device
JPH0666550A (en) * 1992-08-18 1994-03-08 Chuo Denshi Kk Method and device for measuring outer diameter of cylinder
KR100545345B1 (en) * 2003-08-13 2006-01-24 주식회사 에이치오엔 Digital outside diameter and method for controlling thereof
KR100679557B1 (en) * 2004-03-26 2007-02-06 스미토모 고무 고교 가부시키가이샤 Apparatus and method for measuring peripheral surface of mould for forming tire mould

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200490100Y1 (en) 2018-03-20 2019-09-25 두산중공업 주식회사 Cradle device for precise angle measurement
KR102519405B1 (en) * 2022-09-19 2023-04-06 김균식 Portable digital tiltmeter capable of bluetooth communication without an externally protruding antenna

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