G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
G01D3/06—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for operation by a null method
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Physics & Mathematics
(AREA)
General Physics & Mathematics
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Indication And Recording Devices For Special Purposes And Tariff Metering Devices
(AREA)