supplementary : The temperature sensor can measure live readings and compare to 24hrs/All-time records, you can adjust room humidity and indoor temperature levels to protect your possessions and improve room comfort according to those data. The humidity gauge was with a kickstand which could set the humidity meter upright at an easy-to-read angle. in this way you could your room space. : Temperature Readings : ± 2 ~ 3 % RH and ± 1 °F Temperature Range : -58 °F to 158 °F -LRB- -50 °C ~ 70 °C -RRB- Humidity Range : 10 % to 99 % RH Powered by : Powered by AAA battery -LRB- not included -RRB- Product Dimensions : 3.1 x 0.8 x 2.6 inches Item Weight : 2.7 ounces Dry : Humidity is below 30 % Comfort : Humidity is between 30 % -60 %, temperature is between 68 °F -79 °F -LRB- 20 °C -26 °C -RRB- Wet : Humidity is above 60 % Package Contents : 1x Temperature and Humidity Monitor 1 x User Manual .