2-in-1 Design: 2-in-1 Terrarium thermometer hygrometer accurately measures the temperature and humidity of reptile glass tank, hatchers, incubators, etc. Maintain the right temperature and humidity for your pet's habitat. No Battery Required: This reptile tank thermometer hygrometer is physically sensitive to temperature and humidity.No battery required, No radiation. This thermohygrometer features metal movement and ABS housing with color-coded segments to make your terrarium more lively and easy to read. Accurate Measurement: This reptile thermometer and humidity gauge uses mechanical physical induction to accurately measure the temperature and humidity in the glass tank, which is the ideal choice for snake, lizard ,tortoise and incubator. Easy to Install: This terrarium thermometer and humidity gauge is available in two ways, one is 3M double-sided back mount, the other is back wall mount. It can also be used in pet raising, warehouses, hospitals, scientific research, agriculture and other places. Quality Assurance: Customer satisfaction is our goal. If you have any questions, please feel free to contact us, professional service team to give you a satisfactory solution.