ZOO MED DUAL THERMOMETER/HUMIDITY GAUGE Monitor terrarium temperature and humidity with one unit with Zoo Med’s Dual Analogue Thermometer and Humidity Gauge. Thermometer scale: 20° to 120°F (-6° to 49°C). Humidity Scale: 0 to 100%. Allows precise monitoring of both temp and humidity in your terrarium. Made with German movement. Precision results. Velcro backing enabling removal of gauge for cleaning.