ITEM NAME:Vivarium Reptile Tortoise Terrarium Hygrometer Humidity Meter Gauge Rearing Box 1.Using ROHS environmentally friendly materials and humidity sensing components of high precision, high sensitivity 2.Used to measure humidity in vivariums, hatchers, brooders, propagators, etc 3.Monitoring of humidity within an enclosure is essential in providing any reptile species with the correct enviroment 4.Uses colour coded segments for easy reading 5.Sticky pad on reverse allows it to be mounted on most surfaces 6.White pointer, more easy to install 7.It is an ideal space saving and help you know your pets' living enviroment anytime Specifications: Daimeter: Approx.51mm/ 2.01" Humidity range: 0 ~ 100% 1 x Reptile Hygrometer.Humidity range: 0 ~ 100%. White pointer, more easy to install.