Accurately monitor terrarium temperature from -10F to 140F (-23C to 60C) in either Fahrenheit or Celsius at 0.1 degrees with the Zilla Digital Thermometer. The temperature probe is attached to a display unit by a 39" lead wire that can be placed in a convenient spot for monitoring. Choose constant temperature monitoring or turn the unit off and on periodically to save battery power. LR44 battery included.