General Tools DPM300PP Digital Panel Meter with External Sensor Wide range of applications; ideal for refrigeration applications Features Fahrenheit/Celsius switch, high/low alarm, jumbo digital display and 3.28 foot (1 meter) cord with stainless steel sensor Measurement range is -58 to 302 degrees Fahrenheit (-50 to 150 degrees Celsius) Measurement accuracy is +/-1.8 degrees F (+/-1 degree C) from -22 to 302 degrees F (-30 to 150 degrees C); +/-3.6 degrees F (+/-2 degrees C) elsewhere Includes 1 LR44 battery