JP2019060833A5 - - Google Patents

Claims (4)

The monitoring water level scale can be constantly or intermittently monitored on the surface side of the quantity water mark whose back side is fixed and the surface has a water level scale. Vibration, weak current, ultrasonic wave, radiation that does not allow attachment of underwater substances to the monitoring water level scale Quantity water mark characterized by physical antifouling means such as radiation . A non-culture base for aquatic organisms as an antifouling measure that allows the monitoring water level scale to be constantly or intermittently monitored on the surface side of the quantity water mark whose back side is fixed and whose surface has a water level scale, and does not allow the attachment of underwater substances to the monitoring water level scale. A quantitative water mark characterized by providing a transparent synthetic resin layer that is a porous material . The quantitative water mark according to claim 2 which has a transparent silicone resin layer in the surface layer which contacts water at least of a transparent synthetic resin layer . The quantitative water mark according to claim 2 or 3 , wherein the transparent synthetic resin layer is polymerized or crosslinked with the water level scale side transparent resin layer or the synthetic resin layer constituting the water level scale .