1. Wide Usage PH Meter: Ph meter is an essential tool to improve your life quality. This digital ph tester can be applied in the following applications, drinking water quality test, swimming pools quality monitor, PH balance measurement in RO/DI system, aquarium, spa, hot tub, wine brewing, or hydroponics. 2. Three Display Designs for Salinity Test: PPM PPT %. For Swimming Pool Salt Test: 0 9999ppm; Seawater Test: 10 200ppt (1ppt 1000ppm, when ppm figure is over 9999ppm, the meter automatically changes to ppt). For Food Test: 0.01 25%. So you don't have to calculate complex salt content level numbers between different units, which help you to avoid calculating mistake and also makes result reading easier for you. 3. Easy Operation for Salinity Test: When you want to use our pool salt tester, all you need to do is to turn the meter ON and click MODE button to shift to SALINITY function. This easy and convenient operation design is very considerate and premium experience. Wide Application Salinity Meter: Digital water salinity test meter applies for multiple uses, like salinity test for swimming pool, Koi Fish, Seawater, Aquariums Marine Monitoring. 4. Reliable TDS Meter With Accurate Quick Measurement: Digital pool water tester is equipped with premium quality titanium alloy probe, which enables quick and accurate water quality test. Our water quality tester is with 0 9999ppm 0 200ppt wide test range ensures different function of usage. 5. Multiparameter water Test meter is equipped with 5 different functions for water quality test: Salinity TDS EC pH Temperature are combined perfectly in one meter. This is not only been convenient for your different water testing needs, but also saves your time and money, totally a helpful water test kit for your water quality. 6. Tips for Best Performance: If the screen appears unclear, try replacing the battery. For any operation issues, restore the factory settings by pressing and holding the power button for 8 seconds. If the readings seem inaccurate, resetting to factory settings can help, as all parameters are pre calibrated before shipping. Additionally, for precise pH measurement, use the included pH calibration powder to recalibrate after a reset. 7. Packing List: 1.TDS/EC/PH/TEMP/SALT meter 2.PH buffer powders 3PH 4.013PH 6.863 PH 9.18 (Salinity calibration requires the purchase of a separate calibration reagent, which is not included in the kit.). 8. Batteries are shipped with protective diaphragm, need to remove the diaphragm before power on. 9. Calibration Note:In general,EC/TDS/SALT calibration is not required—restoring factory settings is sufficient.For high accuracy requirements, manual calibration is recommended.To restore factory settings, press and hold the power button for 8 seconds.