The Well Sounder 2010 PRO is a sonic water level meter, designed and manufactured by Eno Scientific, to measure static water level in wells, piezometers or boreholes. This portable handheld unit uses sound waves to measure the distance from the top of the well to the water level. This eliminates the need to lower anything into the well. Unlike standard water level tapes these acoustic meters are free from well contamination issues, there is no clean up and nothing to get stuck in the well. Simply place the probe into a well cap opening and turn the unit on, within seconds the unit will display the static water level measurement.