5-IN-1 WATER QUALITY TEST water quality tester designed in 5-in-1 format. pH, TDS, EC, ORP, and temperature can be measured simultaneously with high precision. Omni-directional measurement of water quality to ensure the health of water quality. AUTOMATIC CALIBRATION - The digital ph meter for water uses a 3-point AUTOMATIC calibration method, calibrating the electrode to solutions of pH 4.00, pH 6.86, and pH 9.18 to ensure the accuracy of your measurements. AUTOMATIC TEMPERATURE COMPENSATION - No longer need to pay attention to the temperature of testing liquid, ppm meter can accurately determine the pH value of the sample in the temperature range of 0 C-60 C (32 F-140 F), so as to solve the inaccurateproblem caused by changing the liquid temperature. AUTOMATIC POWER-OFF FUNCTION & LARGE SCREEN DISPLAY - The automatic power-off function turns off the power after 5 minutes without any operation to save power. Employs a fully transparent liquid crystal (LCD) to display 4-digit valuesand the correspondingphysical quantity units. Green Backlit LCD Design guarantees that you can read the measuring results in any condition. MULTIPURPOSE TEST - Portable water quality tester can be carried anywhere to measure water quality such as tap water, RO system water, aquarium, seawater, pool water.