Zoo Med Precision Analog Thermometer is for precise temperature monitoring in terrariums or small animal cages. It offers an extreme temperature range from 20 degrees to 140 degrees F (-28 degrees to 60 degrees C). For precise temperature monitoring in your terrarium or small animal cage Made with precision German movement Unique Velcro backing enables removal of the gauge for thorough terrarium cleaning Extremely high/low range from 20°-120°F Add additional thermometers, one in each temperature zone in your terrarium (for heat gradients).