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Features 1.Touch screen key. 2.High / Low temperature / humidity alert. Specifications 1.Temperature measuringrange: -10~70°C(14~158°F) 2.Humidity measuring range: 10%~99%RH 3.Temperature accuracy: ±1°C Humidity accuracy: ±5% 4.Measurement period: 5S 5.Power supply: 3V CR2032 button battery 6.Size: 88*48*14mm 7.Net weight: 43g Manuals 1.[C/F]Fahrenheit and Celsius temperature switch button. 2.[SET]:Keep pressing the "set" button to set temperature / humidity HI/LO alert data. 3.[CLR]:under normal display state,press "CLR" to clear the Max and Min data.under the setting state,press "CLR" to adjust data. 4.[MODE]:under normal display state ,press "MODE" to open / close temperature and humidity auto switch display function.under the setting state,press "MODE" to open / close alert function. 5.[Toggle switch]: turn on / turn off (on back of thermometer). Attention 1.Keep the screen clean, avoid to dust, oil build-up etc. 2.Don't drop the product. 3.This product is not waterproof?please keep it away from water. 4.When the display dimmed, please replace the battery in time. 5.LCD screen is a capacitive touch screen, please use finger-pulp instead of nails to touch the keys. Trouble shooting: When buttons not working,please clear LCD by clean fabric with alcohol.Then reboot the thermometer