Water Detection Sensor Module

From the shop's description

Water detection sensor is used to detect water leak, water level or rains. This is obtained by having a series of parallel wires exposed traces. The sensor traces have a weak pull-up resistor of 1 MΩ. The resistor will pull the sensor trace value high until a drop of water shorts the sensor trace to the grounded trace. The analog signal output can be read directly to arduino Specifications Operating voltage: 5V Operating current: less than 20mA Sensor Type: Analog Detection Area: 40mmx16mm Product Dimensions: 62mmx20mmx8mm