Free Chlorine Tester for Pool - The Digital Chlorine Tester can quickly help you monitor the concentration of free chlorine ions in your swimming pool. For most pools, the free chlorine concentration range is usually between 1-3 ppm. This effectively purifies the water while keeping it clear and transparent, making the pool look more appealing and swimmers to enjoy a healthy and pleasant swimming experience.Easy to Use - The ORP Meter accurately measures FAC, pH, SALT, EC, TDS, ORP and TEMP values. Backlit design allows measurements in dimly lit environments. Pocket size design to help you measure inground pool, spa, thermal pool and anytime, anywhere.Note: The pH 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 not within this range, FAC will not be displayed normally. Chlorine Meter Specifications: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/cmResolution:1uS/cm 10uS/cm 0.01mS/CMAccuracy:2% F.S.TDS Range:0-10000ppm,10.1-200.0pptResolution:1ppm 10ppmAccuracy:2% F.S.ORP Range999mvResolution:1mvAccuracy:15mvTemperature Range:0.0-60.0 32.0-140Resolution:0.1/0.1Accuracy:0.5Calibration:pH:6.86/4.00/9.18, ORP:222mvTips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use.Colour:As ShownMaterial:PlasticPackage Contents:1 * Water Quality AnalyzerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.