[7 in 1 Pool Water Tester] This tester for pools and spas read 7 different chemicals in the water, Free chlorine, pH, salinity, ORP, TDS, EC, and Temp. Easy to use, dip tester in your pool or spa, and you'll have immediate pH, salt, free chlorine, and other chemicals levels. [Accurate Free Chlorine Pool Tester] ORAPXI pool tester is highly accurate and reliable, giving you accurate and consistent readings to ensure your spa and hot tub water is safe and healthy for use. Help to keep the pool chemistry in balance and will make "pool time" an enjoyable and pleasant experience. [Great Salt System Tester for Saltwater Pool and Hut Tub] A proper level of salt will ensure that the generator is able to produce the desired amount of chlorine and keep the water safe and clean. The salt monitor can test both the free chlorine and salt concentration, to know both levels are in the optimum range for clear pool. [Helpful to Quickly Reading the pH Level of Pool Water] A must have for every pool owner, keep track of pH level, and adjust your pool during pool season. Easy to use, just dip probe into the saltwater pool or take a cup of sample for measurement, and then observe the pH results. [More Practical Functions of 7 in 1 pH Meter] Lab quality probe with 0.01 resolution, high-accuracy algorithm chip and probe ensure accurate and fast response. Auto temperature compensation (ATC) ensures reliable performance. 7 in 1 function to meet your various measurement needs.