describe:Swimming Pool Free Chlorine Tester - A digital chlorine tester can quickly help you monitor the concentration of free chlorine ions in your swimming pool. For most swimming pools, free chlorine concentrations typically range between 1-3 ppm. It effectively purifies water while keeping it clear and transparent, making the swimming pool look more beautiful and allowing swimmers to enjoy a healthy and pleasant swimming experience.Salt Water Pool Salt Tester - A salinity meter can help check the salt level (perfect level: 2700-3400 ppm) of salt water pools and hot tubs with salt chlorinator systems. Helps salt chlorinators work more efficiently at the proper salinity values. A salt meter can help you keep your pool clean and prevent too much or too little salt from negatively affecting your body and your pool equipment.Pool pH Tester - pH: 0.00~14.00; The ph pool tester can help check the pH value of the pool. Maintaining proper pH is critical to the operation and maintenance of a saltwater pool. Typically, the perfect pH range is 7.2 to 7.8. Regular pH testing and adjustments help clean water, provide comfortable swimming, and protect pool equipment from damage.Swimming pool chlorine tester VS swimming pool test strips - When using test strips for testing, you must determine the value of the pool based on the color of the test strip; however, the chlorine residual meter is simpler and more accurate than test strips, and users who are not sensitive to color can also More friendly. Just place it in the water for a few seconds to get an accurate reading.EASY TO USE - The 7-in-1 ORP meter accurately measures FAC, pH, SALT, EC, TDS, ORP and TEMP values. Backlit design allows measurements in dimly lit environments. Pocket-sized design helps you measure inground pools, spas, hot spring pools anytime and anywhere. Have you been struggling to find a saltwater pool tester that is both accurate and easy to use? The multi-functional pH EC meter of IELI tells you the answer.Note: The pH value of the swimming pool water should be between 6.5-8pH, and the ORP should be between 487-840mv, so that the FAC (chlorine) value can be displayed normally. If any value of pH and ORP is outside this range, the FAC will not display properly.PH range: 0.1-14.0Resolution: 0.1phAccuracy: 0.1phFAC (free available chlorine) range: 0.1-4.0ppmSalt range: 0-10000ppm, 10.1-200.0ppt, 0.01%-25.00% (1000ppm=1ppt)Resolution: 1ppm, 10ppmAccuracy: 2% F.S.EC range: 0-10000uS/cm, 10.01-19.99mS/cm, 20.1-400.0mS/cm,Resolution: 1uS/cm 10uS/cm 0.01mS/CMAccuracy: 2% F.S.TDS range: 0-10000ppm, 10.1-200.0pptResolution: 1ppm 10ppmAccuracy: 2% F.S.ORP range: 999mvResolution: 1mvAccuracy: 15mvTemperature range: 0.0-60.0 32.0-140Resolution: 0.1/0.1Accuracy: 0.5Battery: 4*1.5V LR44 (not included)Color: as shown in the picturematerial: plasticPackage Contents:1 x 7-in-1 testerContains only the above package contents and does not include other products.NOTE: Light reflections and different monitors may cause the color of the item in the picture to differ slightly from the actual item. The measurement allowance is +/-1-3cm.