These water level meters utilise a choice of probe designs attached to a permanently marked polyethylene tape, fitted on a well-balanced reel.
Conductors embedded within the tape each have seven strands of stainless steel for strength and flexibility.
The probes used in the water level meters incorporate an insulating gap between electrodes, so when contact is made with water, the circuit is completed and a loud buzzer and light is activated.
Water level measurements are then taken directly with a reading from the tape at the top of the well casing or borehole.
Solinst 101 water level meters are powered by a standard 9 volt battery, housed in an easy-access battery drawer.