Description 7-in-1 pH Meter: The water quality tester has a seven-in-one function, which can measure TDS, EC, ORP, SG, salinity and temperature at the same time with high accuracy. The measuring range is wide and wide, and it can measure the salinity of fresh water and sea salt. Comprehensive water quality measurement to ensure healthy water quality. Self-calibrating pH Tester: With the highly sensitive glass probe, you get the full measuring range from 0 to 14 pH, 0.01 pH resolution. In addition, the pH meter uses a 3-point calibration method and calibrates the electrode in pH 4.00, pH 6.86 and pH 9.18 solutions, which you can easily calibrate to ensure the accuracy of the measurement. High-precision water tester: The high-precision algorithm chip and electrode of our digital water pH tester ensure accurate and fast response. Large backlit LCD screen ensures reading of measurement results in all conditions. One-button hold function allows you to lock the reading even when the pH