Electronic pH Tester, 5-in-1 Pool Water Tester with Backlight, pH/TDS/EC/Salinity/Temperature with ATC, High Precision pH Meter with 0.01 Resolution, for Drinking Water, Aquarium, Spas

General Description This 5-in-1 electronic pH tester is a versatile tool for measuring the pH, salinity, conductivity (EC), temperature, and TDS (Total Dissolved Solids) of water. It is ideal for home or laboratory use, allowing you to test the pH balance of drinking water, swimming pools, aquariums, RO systems, spas, or hydroponic systems. Its backlit LCD screen makes it easy to read the displayed values, even in low-light conditions. Technical Specifications pH Resolution: 0.01 pH pH Accuracy: ± 0.05 pH TDS Resolution: 1 ppm / 0.1 ppt TDS Accuracy: ± 2% Conductivity Resolution: 1 µS/cm / 0.1 mS/cm Conductivity Accuracy: ± 2% Temperature Resolution: 0.1℃/℉ Temperature Accuracy: ± 0.5℃ Salinity Resolution: 0.01% Salinity Accuracy: 0.01-5.00% (±0.1%), 5.10-25.00% (±1%) Waterproofing: IP67 Operation To use the tester, press the power button to turn it on. You can lock the displayed value by pressing "HOLD" and change the temperature unit by holding down the "HOLD" button. To switch between different functions, use the "MODE" button. After each measurement, it is recommended to rinse the probe with distilled or pure water for 5 to 10 seconds and dry it before measuring a new solution. Other information: Automatic calibration, Automatic shut-off. Do not use to measure concentrated acid or alkali solutions. The sensitive bulbs are fragile; avoid contact with hard objects. Do not test solutions at temperatures above 50 degrees Celsius. For accurate calibration, follow the calibration sequence: pH 4.00, pH 6.86, pH 9.18.