Automatic temperature compensation PH/TDS/EC/salinity/thermometer 5-in-1 pH meter electronic pH meter 5-in-1 pH Tester: The tester can measure pH, salinity, EC, TDS, and temperature. Simply press the button (MODE/CAL) to switch and read the values between pH, salinity, EC, and TDS. Long press the H0LD/TEMP button to switch between temperature and degrees Celsius. Use it for daily water quality monitoring, so you can understand the water quality status at any time. Automatic Temperature Compensation: The pool pH meter doesn't need to consider the temperature of the liquid being measured. Capable of accurate measurements within a temperature range of 0°C to 60°C (32°F to 140°F), this instrument eliminates the problem of inaccurate measurements caused by fluctuating liquid temperatures. Whether you're in winter or summer, you'll get accurate readings. Humanized Design: The backlight function of this pool pH meter allows you to clearly see the data even in low-light conditions. The H0LD/TEMP button can be used to lock the reading, turning the backlight off in 30 seconds and back on again by pressing any key. </span></li> <li class="a-spacing-mini"><span class="a-list-item">Easy Calibration: This pool tester supports three-point automatic calibration, which can be easily automatically calibrated to 4.01, 6.86, and 9.18 according to the instructions. The device has been calibrated at the factory and is ready to use when you receive it. If you need to recalibrate, there is no need to worry about finding the calibration solution (calibration kit is included in the box). </span></li> </ul> </li> </ul> </div> </li> </ul>