The Exo Terra Analog Hygrometer is great for monitoring your reptile's terrarium humidity levels. The Hygrometer has a clear analog dial display making it easy to read the humidity levels in the terrarium. The Exo Terra Analog Hygrometer is easy and quick to install, just simply adhere the hygrometer in the terrarium. Key Features : *Easy to read and install *Clear analog dial display *Helps monitor the terrarium humidity levels.