SainSmart High Sensitivity Water Sensor for Arduino UNO MEGA R3 Mega2560 Duemilanove Nano Robot XBee ZigBee Judge the water level through with a series of exposed parallel wires stitch to measure the water droplet/water size . Easily change the water size to analog signal, and output analog value can directly be used in the program function, then to achieve the function of water level alarm. Low power consumption, and high sensitivity, which are the biggest characteristics of this mdoule. Compatible with Arduino UNO, Arduino mega2560, Arduino ADK etc.