6-in-1 Multi-Function TesterThis smart monitor combines six basic functions and can measure pH,EC,ORP,chlorine,salinity and temperature simultaneously.All-round water quality measurement provides comprehensive analysis of the water quality of your swimming pool,spa,and even drinking water to ensure healthy water quality.Salt range:0-999ppm,1000-9990ppm;chlorine:0.1-4.0 mg/L;redox potential:-999mV~+999mV;EC:0-9990uS/cm;10.01-19.99 milliseconds/cm;temperature: 0.0-60.0 C;32.1-140.0F. Smart App ControlWe can connect the monitor to an iOS or Android device via Bluetooth on a smartphone anytime, anywhere to facilitate real-time monitoring and data analysis through free apps. The water tester's data memory storage capacity is up to 1000 records, allowing you to track and analyze historical water parameter data over time. Data can also be saved to Excel, shared with your friends, and printed. Simple and Practical DesignJust open the tester and place it in the water, and accurate data will appear in a few seconds. The flotation device design allows the ph meter to remain buoyant on the surface of the water, ensuring continuous monitoring without sinking or submerging. The digital pool water tester also has a backlight function, which makes it easy to read data in low-light environments, and has optional units, which brings you great convenience. Precise Sensor, Real-Time AlarmThe water quality tester can set the maximum and minimum limits of pH, EC, ORP and chlorine. When the detected temperature exceeds the preset high/low temperature, alarms and notifications will be received on the connected device. A beep sound is emitted. We can easily monitor and control water quality. Operation GuideThe instruction manual provided will guide you on how to operate. Short press the ON/OFF button to turn the device on and off;long press the ON/OFF button to turn the Bluetooth function on and off. Short press the MODE/CAL button to convert EC/PPM/CL/pH/ORP (mode conversion); long press the MODE/CAL button to calibrate EC/SALT/pH/ORP. Short press the HOLD/TEMP button to lock the value; long press the HOLD/TEMP button to switch between and buttons (mode switching). NOTECannot be charged or opened to change batteries.It comes with a battery inside, so it's best not to open it, as it may not tighten and cause water to enter.