Sit back and relax, the DigiTech Wireless Water Sensor will let you know what's happening inside your water tank! You no longer have to keep a constant eye on the water tank to make sure the water isn't too full or too low! The wireless water tank sensor has two parts: a sensor unit that sits in the top of the water tank and a digital monitor that you can set up in another part of your home. The monitor keeps track of the room temperature where the tank is located, as well as the water temperature and water level. It can record min/max water levels and display current temperature and water level on a 10-element bar graph that is very easy to read. You can set an alarm using the digital monitor to alert you if the water reaches a certain level (high, low or empty). So you won't have to keep running to the garage every time the water tank crosses your mind! Just set the monitor on a desk or counter and take your mind off the tank! Add the DigiTech Wireless Wate Product Specifications: Measures in Celcius and Farenheit Indoor / Interior Scale : 0.0C Celcius Accuracy : +/- 1 % Thermometer Resolution : 1.0C Dimensions for : Receiver Length : 106.0mm, Width : 97.0mm, Depth : 24.0mm Dimensions for transmitter: Diameter : 47.0mm Main Product requires 2 x AA batteries Transmitter requires 6 x AAA batteries Tank empty alert : true Tank level display : metres Tank level depth : 0.0m, 15.0m