https://www.fiedler.company/en/products/water-level-meters/level-gauges-wells-boreholes-and-reservoirs/h520-level-meter-wells-reser
H520 level meter for wells, reservoirs and tanks | FIEDLER | Electronics for ecology
The H520 level meter is intended for measuring the water level in wells, boreholes, retention tanks and rainwater and wastewater sumps..
reservoirs and tankslevelmeterwells