YIERYI 7-in-1 pH Meter, Pool Salt Tester, Chlorine Tester with Smart Hub, Digital Chlorine Meter for Swimming Pools

7-in-1 Multi-Parameter Testing :simultaneous measurement of seven key water quality parameters: pH (acidity and alkalinity), EC (electrical conductivity) , TDS (total dissolved solids), Salinity, ORP (oxidation reduction potential), Temperature, Free Active Chlorine (FAC). Solar+USB charging model: This model supports solar and Type-C USB charging dual mode, you can use the small screwdriver included to open the waterproof port and charge it through the USB cable. If you use it for a long time on cloudy days or indoors, it is recommended to use USB for regular charging. This model is built-in rechargeable lithium battery, no need to replace the battery Smart Bluetooth & App Integration :Connects to a dedicated mobile app via Bluetooth for: Real-time data display / Historical data logging / Parameter alerts & calibration records High Accuracy with Auto CalibrationBuilt-in high-sensitivity glass electrode with 5-point automatic calibration ensures precision and stable performance