5 in 1 pH Tester: The tester can measure pH, salinity, EC, TDS and temperature. Simply press the (MODE/CAL) button to switch and read the values between pH, salinity, EC, and TDS. Long press the HOLD/TEMP button to switch between temperature and Celsius. Used for daily water quality monitoring, allowing you to know the water quality status at any time. Automatic Temperature Compensation: The pool pH meter does not need to take into account the temperature of the liquid to be measured. This instrument is capable of accurate measurements over a temperature range of 0°C to 60°C (32°F to 140°F), which solves the problem of inaccuracy due to liquid temperature fluctuations. Whether you are in winter or summer, you can get accurate values Human-scale design: The backlight function of this ec tester allows you to see the data clearly even in low light conditions, The HOLD/TEMP key can be used to lock the reading, and the backlight will turn off within 30 seconds, Press any key to turn on the