- Wide usage PH meter: This digital PH tester is a versatile tool for monitoring water quality in drinking water, swimming pools, RO/DI systems, aquariums, spas, hot tubs, wine brewing, and hydroponics. - Three display designs for salinity test: Readouts in PPM, PPT, and %. For swimming pool salt testing: 0-9999 ppm; seawater: 10-200 ppt (1 ppt = 1000 ppm). When ppm exceeds 9999, the meter automatically switches to ppt. For food tests: 0.01-25%. - Easy operation for salinity test: To test salinity, turn the meter on and press MODE to switch to the SALINITY function. Suitable for pool salt testing, koi fish, seawater, aquariums, and marine monitoring. - Reliable TDS meter with accurate and quick measurement: Digital pool water tester uses a premium titanium alloy probe for fast and accurate readings. Test ranges are 0-9999 ppm and 0-200 ppt. - Multparameter water test meter: Combines 5 functions in one device — Salinity, TDS, EC, PH, and Temperature. This integrated design supports diverse water quality testing needs, saving time and money.