Test pool salt level - Salt range: 0.01%-25.00%/0-10000ppm/10.1-200.0ppt; The salinity tester can help check the salt level (Ideal level: 2700-3400 ppm) of the saltwater pool and hot tub with salt chlorinator system. Help the salt chlorinator work more efficiently in the appropriate salinity value. Test the pH level of the pool- pH: 0.00~14.00; The pH tester can help check the pH level of the pool. Maintaining the proper pH level is critical to the operation and maintenance of saltwater pools. Typically, the ideal pH range is between 7.2 and 7.8. Regular pH testing and adjustment can help ensure clean water, and comfortable swimming, and protect pool equipment from damage. Monitor Salinity & pH for Saltwater Aquariums - For most saltwater tanks, the salinity range typically falls between 22-35ppt. However, if you intend to keep corals, a higher salinity level of 31-36ppt is recommended. The ideal pH range for most saltwater aquariums is 8.1-8.4. Regularly testing the pH and salinity levels of the fish tank is crucial for maintaining water quality and ensuring the well-being of the fish. Digital Tester VS Test Paper - with a test paper test, you have to guess the value of the pool based on the color of the paper; however, a tester is simpler and more accurate than test paper, just put it in the water for a few seconds to get an accurate reading, plus, using enough test paper increases the cost in the long run. Easy to Operate and Multifunction - The 7 in 1 salinity meter can precisely measure PH, Salt, ORP, SG, EC, TDS &Temp values. The LCD backlight makes the meter easy to read even in the dark. Uses a three-point calibration method that automatically identifies the calibration solution. salinity tester has an automatic temperature compensation function(32F~140F), which can decrease the error caused by the change in liquid temperature.