5-in-1 pH Meter: This pH meter simultaneously measures pH, TDS (ppm), conductivity (EC), salinity (ppt) and temperature with high accuracy. High Accuracy: The high-precision algorithm chip and high-sensitivity probe allow you to quickly obtain accurate results. The green backlit LCD display allows you to easily read the measurement results under any circumstances. Simply press the HOLD/TEMP button to lock the measured value and remove it for easy viewing Automatic Calibration: You no longer need to worry about calibration, because the pH meter has an automatic calibration function, also known as the 3-point calibration method, and comes with a calibration powder (standards: pH 4.00, pH 6.86, pH 9.18) Automatic Temperature Compensation: The pH meter no longer needs to pay attention to the temperature of the test liquid, the pH meter can accurately determine the pH value of the sample within the temperature range of 0°C-60°C (32°F-140°F), to solve the inaccurate problem caused by the