measuring the depth of water in wells, boreholes, and standpipes, the
Testwell Water Level Meter is accurate to 1/100 ft or one millimeter.
The meter uses a choice of probe designs, attached to a permanently
marked polyethylene tape, fitted on a well-balanced reel. It is powered
by a standard 9 volt battery housed in an easy-access battery drawer.
The probe incorporates an insulating gap between electrodes. When contact
is made with water, the circuit is completed, activating a loud buzzer
and a light. The water level is then determined by taking a reading
directly from the tape at the top of the well casing or borehole. The
0.7" diameter probe is constructed of stainless (316) steel with
a Teflon shroud.