Use the Primo Instant Read Thermometer to accurately measure the internal temperature of your food. It has a large, easy-to-read display and provides full temperature readings in two to three seconds. This thermometer displays in Fahrenheit and Celsius, has right and left handed display that rotates 180° for easy viewing, and a temperature range of -40°F to 660°F. It also features a backlit display for nighttime viewing and a low battery display indicator. The thin probe tip makes for easy measurement and it automatically powers on when probe is opened and shuts off when closed. Also, you can press the hold button to lock the temperature reading. You can calibrate the thermometer by inserting the probe tip in known water temperature (ice water 32°F or boiling water 212°F). Two AAA batteries are included.