4-IN-1 PH METER: The water quality meter can simultaneously measure pH, TDS (ppm), EC (conductivity) and temperature with high accuracy. You can use it to perform a hardness test. of water, pH of liquids or conductive liquids. Note: EC and TDS modes are stable for a long time. EC/TDS/pH modes can be quickly reset to restore the factory calibration status, without the need for frequent calibration. HIGH ACCURACY: The 4-in-1 pH tester is equipped with a high-sensitivity glass electrode combined with a fully intelligent chip. The measuring range is from 0.00 to 14.00 pH, and the measuring accuracy reaches 0.01 pH, ensuring fast, accurate and stable results. AUTOMATIC CALIBRATION: You no longer have to worry about calibration. Simply place the electrode in a standard pH solution and press the MODE/CAL button for 3 seconds. Then the LCD screen flashes 3 times and the automatic calibration is completed. The tester comes with 3 sachets of calibration powder (standard: pH 4.00, pH 6.86, pH