Temperature and Humidity Sensor. Keep your lash room at the optimum temperature and humidity for effective drying of your lash extension glue. 
 
Specifications:
- The temperature range: -50 degrees celcius - + 70 degrees celcius (-58 ° F - + 158 ° F)
- Accuracy: ± 1 degrees celcius, ± 5% RH
- Humidity level: 10% - 99% RH
- Power supply: 1 AAA battery (1.5V) (battery is not included)
- Dimension: 106 x 98 x 22mm
 
Package included:
1 x HTC-2 Hygrometer Thermometer