The Zoo-Med Creature Dual Thermometer and Humidity Gauge allows for precise monitoring of both temperature and humidity in your invertebrate’s habitat. Easy to set up! Glows-in-the- Dark! Allows precise monitoring of both temperature and humidity in your invertebrate’s home. Temperature and humidity levels are extremely important for the long-term health of your invertebrates. Unique Velcro backing enables easy removal for the cleaning of your invertebrates enclosure.