PH Meter with Wide Application Hofun's pH meter is an important tool to improve your quality of life. This digital pH meter can be used in the following applications: drinking water quality testing, pool quality monitoring, pH balance measurement in RO/DI systems, aquariums, spas, hot tubs, or hydroponics. Three display models for salinity testing: PPM + PPT + %. For saltwater pool testing: 0-9999 ppm; Seawater testing: 10-200 ppt (1 ppt = 1000 ppm, when the ppm figure is over 9999 ppm, the meter automatically switches to ppt). For food testing: 0.01-25 %. So you don't need to calculate complex salinity levels between different units, which helps you avoid calculation errors and also makes it easier to read the results. Easy operation for salinity testing: When you want to use our pool salt meter, you just need to turn on the meter and click the MODE button to switch to the SALINITY function. This simple and convenient operation is very thoughtful and provides a first-class experience. Salinity meter with wide application: Hofun's digital water meter for salinity testing is suitable for multiple uses, such as saltwater testing for pools, Koi fish, seawater, aquariums, and marine monitoring. Reliable TDS meter with accuracy and fast measurement Hofun's digital ppm meter is equipped with a premium titanium alloy probe, which enables fast and accurate water quality testing. Our water quality tester has a wide test range of 0-9999 ppm and 0-200 ppt, ensuring various uses. Hofun multi