Electronic pH Meter, 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, Aquariums and Hot Tubs

【5 in 1 Function】This water testing kit includes a pH meter, a TDS meter and an EC/Salinity/Temperature meter. The backlit LCD display allows easy reading of the displayed values. 【Simple Operation】Press the power button to turn on. Press "HOLD" to lock the value. Press and hold "HOLD" to change the temperature unit. Press "MODE" to cycle through different functions. 【Absolute Accuracy】pH resolution: 0.01pH, accuracy ±0.05pH. TDS resolution: 1 ppm / 0.1 ppt, accuracy ±2%. Conductivity resolution: 1 µS/cm / 0.1 mS/cm, accuracy ±2%. Thermometer resolution: 0.1°C / °F, accuracy ±0.5°C. Salinity resolution: 0.01%, accuracy 0.01–5.00% (±0.1%) / 5.10–25.00% (±1%). 【Wide Range of Applications】Ideal for home and laboratory use. Suitable for determining the pH value of drinking water, swimming pools, aquariums, reverse osmosis systems, hot tubs, or hydroponic systems. 【Robust and Durable】This pool tester is waterproof (IP67) and can therefore be used even after being immersed in an aquarium. Prolonged exposure of the electrode to air may cause slow and unstable readings due to drying out. Before use, the electrode should be immersed in water for a few hours and the device should be recalibrated.   Package Contents:5-in-1 Water Quality Tester, pH 4.00 Calibration Powder, pH 6.86 Calibration Powder, pH 9.00 Calibration Powder, User Manual, Features:Automatic Calibration, Backlit LCD Display, IP67 Waterproof, Auto Power Off, Easy to Use, Value/Temperature Lock: Press the "ON" button to turn on the device, the "HOLD/TEMP" button to lock the value, and press and hold "HOLD/TEMP" to change the temperature unit. Mode Selector: Press the "ON" button to turn on the device and touch "MODE/CAL" to switch between modes. Quick and accurate calibration of pH meters 1. Before calibration, add pH4.00/pH6.86/pH9.18 buffer powder to a container with 250 ml of distilled water and stir until the powder is completely dissolved. 2. Press the "ON/OFF" button to turn on the pH meter and enter pH mode. 3. Immerse the electrode in the pH 6.86 standard solution and wait for the reading to stabilize (usually 5 to 10 seconds). 4. Press and hold the MODE/CAL button for 6 seconds, then release it until the pH 6.86 indicator stops flashing and the pH 6.86 calibration is complete. 5. Repeat the above steps to calibrate at pH 4.00 and pH 9.18 in the specified order. NOTE: It is essential to follow the calibration sequence: pH 6.86, pH 4.00, pH 9.18. Otherwise, the calibration result will be inaccurate. Further operational videos are available at the following link: https://files.fm/u/e2w326wwvg