It’s easy to use the Zoo Med Dual Analog Thermometer and Humidity Gauge to keep your reptile or amphibian pal at the proper temperature and humidity. You can precisely monitor the temperature and humidity of your terrarium, all in one place. This dual gauge was designed to be easy to see and use. With its dual analog, color-coded dials it is very simple to use. It will help you maintain a balanced and healthy environment for your pet. It is perfect for both arid or tropical environments. Setting couldn’t be easier with convenient velcro backing that makes it easy to clean and move to where you need it. And with no batteries or outlets needed you can use it out of the package.