This is a reliable instruments for measuring water level and total depth in boreholes wells, reservoir Etc . Boreholes wells reservoir, etc. for the measurement the bob is lowered to the water level , when touching the level A sensor effects the illumination of a single lamp . an additional acoustic single will be Released by a buzzer when the probes is touching the water level there is a connection between the of the probes and the sensor body thereby a circuit of the lamp and the buzzer will be closed probe is of stainless steel having A length of 15cms , the sensor is fitted at a distance of 6cms from tip . The sensor is fitted inside so it my give us complete accuracy. the length of the wire will start from sensor . Response is seen on led plus an audible tone is heard feature: Cable length: 50, 100, 150, 200, 250, 300meter with marking on ever 1 meter. 1 meter length flexible measurement scale will be provided with this system for fine resolution (1cm) Reel type spol for lowering cable and electrode assembly. Reel is mounded on a stand. Self contained 9 Volts battery power supply - No danger of shock from an outside power supply. Standard brass electorode. Reel handles are shaped to fit your hand made od SS . Accurate of reading Each water level indicator is supplied with a battery.