... 3.CE.UL.RoHS 4.ISO9001 2008 Digital water level meter Ultrasonic liquid level meter working principle: the probe launch a bunch ... and conversion it, thus we can know the corresponding measured distance. This product is non-contact measurement, high precision, ... Such as: storage tank, materials trough, pool, well, Drains, measuring boxes, granaries, silo, etc.Specifications1.Power supply: DC24V(±10%),0 ...