HIGH ACCURACY MEASUREMENT: This temperature and humidity meter has a temperature accuracy of ±1℃ and a humidity measurement range of 10%‑99%, providing accurate temperature and humidity data. LIGHT POWERED: In addition to being battery assisted, this thermohygrometer can also be powered by light, requiring only 200Lx of brightness, through light, lights or flashlights and other light sources. TEMPERATURE UNIT SWITCHING: This thermohygrometer supports switching between Celsius and Fahrenheit temperature units to meet the needs of users in different regions. FAST MEASUREMENT CYCLE: The measurement cycle is 20 seconds/time, which provides real time temperature and humidity data, you can quickly get the current environmental conditions. LONG BATTERY LIFE: This temperature and humidity meter has a built in 50mAh lithium ion battery, the pure battery life reaches 150 days, dual power supply of light energy and battery, bringing you convenience.