Static water level ruler, widely used in groundwater monitoring.It consists of a sensor, ruler with winch and carrying case.Simple operation and convenient maintenance.When using, just lower the ruler belt slowly. When the sensor encounters water, the buzzer and indicator light on the winch start to issue a prompt, thereby determining the water level based on the ruler belt scale.The ruler belt has a prominent metric scale (minimum scale 1mm) for easy reading.This water level ruler is available in a variety of types, with the length of the ruler ranging from 10 m to 1800 m.There are two sensors to choose from.