Made of sturdy plastic material, this hygrometer and is safe, and can be used for long time. There is a large number digital display effect, multi-purpose, can be used for indoor, bedroom, home, factory, car, laboratory and many other scenes. Features -Color:Black -Material:Plastic -Size:4.80X2.80X1.60cm/1.89X1.10X0.63in -Temperature Range: -50°c ~ 70°c -Measuring Humidity Range: 10% RH ~ RH -Battery: 2 x 1.5V LR44 -Power dissipation: 5 milliwatts in working condition -Humidity Display Resolution: 1% RH -Temperature test accuracy: ±1.0 degree centigrade -Humidity test accuracy: ±5%(Room temperature 25 degree centigrade) - High precision: Indoor as well as hygrometer can accurately measure the temperature and humidity in the car, let you have more driving comfort. - Multi-functional design: It can display temperature and humidity at the same time, convenient for real-time monitoring. - Compact and portable: , the indoor is easy to install in any position in the car. - Suitable for home use: Not only suitable for car use, but also for home environment monitoring, the indoor satisfy your demands better. - Wide applications: This can be used in living room, dining room, baby room, kitchen, office, garden, terrace, factory and more places. Package list: 4 x Hygrometer Thermometers