Zoo Med's precision analog reptile thermometer allows you to accurately read and monitor the temperature in your reptile's terrarium. Improper temperature is the leading cause of stress and illness in captive reptiles. Extreme temperature range from 20 degrees to 120 degrees F for precise temperature monitoring. It is made with precision German movement and the unique Velcro backing enables removal of the gauge for thorough terrarium cleaning. Shipping weight: 1/5 lb.