Features 1.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. 2.LIGHT POWERED: In addition to being battery assisted, this thermohygrometer can also be powered by light, requiring only 200Lx of brightness, through natural light, lights or flashlights and other light sources. 3.TEMPERATURE UNIT SWITCHING: This thermohygrometer supports switching between Celsius and Fahrenheit temperature units to meet the needs of users in different regions. 4.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. 5.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. 6.INDOOR AND OUTDOOR UNIVERSAL: This thermo hygrometer can be widely used in homes, warehouses, greenhouses and other environments, helping you to grasp the temperature and humidity conditions of the space. Specification Item Type:TemperatureandHumidityMeterMaterial: ABSCharging Method: Light Energy Power Supply + Battery Auxiliary Power SupplyBrightness Required For Light Energy: About 200Lx (e.g. Natural Light, Light or Flashlight)Temperature Accuracy: 1Temperature Unit: Degrees Celsius, Degrees FahrenheitTemperature Measurement Range: -20-70(-4-158)Humidity Measurement Range: 10%-99%RHMeasurement Cycle: 20s/TimePure Battery Life: 150 DaysBattery Type: Built in 50mAh Lithium Ion Battery Package List 1 x TemperatureandHumidityMeter