Solu &reg; Water Level Sensor Depth of Detection Water Sensor for Arduino// High Sensitivity Water Sensor// Water Level Sensor Module Depth of Detection Liquid Surface Height for Arduino M About us (Solu ), Professional factory of circuit boards for Arduino Production process: FR4 double-sided HASL Operating voltage: DC 3-5V, &lt; 20mA Applications :Rainfall detecting,Liquid leakage,Tank overflow detector Judge the water level through with a series of exposed parallel wires stitch to measure the water droplet/water size .