PH-2 Pro Litmus Tester Litmus Test Paper Color Change PH Meter Water Quality Meter MacBook Pro 13" 2019 A2159 feature：1

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PH-2 Pro Litmus Tester Litmus Test Paper Color Change PH Meter Water Quality Meter MacBook Pro 13" 2019 A2159 feature：1The main function: 1. Reset function: Press and hold the power button for 3 seconds in the power on state, and then release it, when the screen displays " ", the reset is successful 2. Automatic temperature compensation function: 0 80 degrees Celsius 3. Power off data storage function: the data will be automatically saved after the battery is pulled out, and the storage time is one month 4. Test paper function: the color of the backlight will change

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