Zoo Med Creatures Dual Reptile Thermometer & Humidity Gauge; Make sure your cold-blooded companion is comfy and cozy with the Zoo Med Creatures Dual Reptile Thermometer & Humidity Gauge. This glow-in-the-dark gauge is designed to help you monitor both the temperature and humidity of your homie’s habitat. It features a unique hook and loop backing that allows for easy setup and removal for cleaning. The precise output provided by this tool will help keep your reptile happy and healthy for a long time to come.