TL‑505 Temperature Humidity Data Recorder Multifunctional Digital Thermohygrometer Item Type: Temperature Humidity Recorder Material: ABS Temperature Range: -40~105℃ (-40~221℉) Accuracy: ±1℃/℉ Humidity Range: 0%-100% Accuracy: ±3% Heat Index: 21.1~54.4℃ (70~130℉) Dew Point Temperature: -40~105℃ (-40~221℉) Operating Temperature: -30~80℃(-22~176℉) Operating Humidity: 10~90%RH Storage temperature: 0~40℃(32~104℉) Storage Humidity: 0~75%RH Resolution: 0.1℃/℉; 1%RH Product Size: Approx. 55 x 90 x 35mm/ 2.2 x 3.5 x 1.4in Weight: Approx. 128g/4.5oz Working Power Supply: 2 x 1.5V AA Battery (Battery Not Included) How e: First Way: Connect the power via USB, you can use it; Second Way: Insert the battery, the screen display can be used, there are relative parameter adjustments on the product, the user can adjust appropriately. This data logging function (up to 80,000 data can be stored), can be connected to a computer to preview and download data.