The Ryobi Infrared Thermometer offers an easy and intuitive way of measuring temperatures in °C or °F without the need for physical probes. It highlights an 8 circular laser dot projection to indicate the exact measured area and displays the measurement on screen. With a large measuring range from -50°C to 550°C you can use this infrared thermometer around the home to test a vents output, detect hot spots, measure temperature in electrical boxes, detect excessive heat in your vehicles brakes, monitor tyre temperature on long trips and test for blockages in a radiator and many other applications. Featuring a distance spot ration of 8:1; which means at 8 metres distance you will measure a 1 metre diameter area.This infrared thermometer requires a 9V battery (included).