Temperature range: -20℃ ~ 60℃（-4 ~ 140℉） Temperature accuracy: ±0.3℃(25℃) Temperature unit: ℃（Celsius) and ℉（Fahrenheit）Optional Humidity range: 0 ~ 99.9%RH Humidity Accuracy: ±2%RH (30-90%RH) Resolution: Temperature: 0.1℃ Humidity: 0.1%RH Sensitivity Decay: Temperature: less than 0.1℃ per year Humidity: less than 0.5 %RH per year Voltage: Battery: 3.7V USB: 5V Power: Build-in Lithium battery (rechargeable) Battery lifetime: At least to be used more than 1 year if full recharging if without any button and buzzer operation Working Environment Temperature: -20℃~+60℃; The LCD will have slow reaction in low temperature, however, it will have no influence for normal testing. It will show normally when temperature resumes
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