Multi-function pH meter for water: Press the "TEMP/CALI" key to switch,PH/℃/F can be switched at will,can measure pH value and temperature.The measurement range of pH meter is: -2.00-16.00PH (usually 0.00-14.00PH),temperature range: 0-80℃/32.0-176°F. High Accuarcy: Ph tester digital has a sensitive electrode sensor to read accurate PH levels.The pH pen resolution: 0.01PH and automatic temperature compensation function: 0-80℃. Test Paper Function pH meter: The ph meter backlight color will change as the pH value changes, just like litmus paper.Compared with traditional test strips, this ph tester digital is more convenient,faster and more environmentally friendly. Reset function: When the ph tester is powered on, press and hold the power button for 3 seconds, release it and when the ph tester digital screen displays: "--" it means the water ph tester reset is successful. Power-off data storage function:The ph meter data is automatically saved after the battery is removed, and the storage time is one month.