Pool ±0.01 High Accuracy PH Tester for Hydroponics PH Meter Aquarium 4 in 1 Digital PH Meter with pH or TDS or EC or ATC Function for Drinking Water With 4 in 1 pH tester, you can accurately measure PH, TDS, EC and Temp values. Comprehensive water quality testing to ensure we can use healthy water. Simply immerse the pH meter electrode into the target solution, press and hold the HOLD or TEMP button after the reading is stable, and then read the data. Before using the pH meter again, please clean the probe thoroughly to avoid affecting the reading. With the highly sensitive probe, you can quickly read the results. The wide measuring range and high resolution of this 4-in-1 pH meter ensure that you can measure different types of liquids. Thanks to the pH meter's precise ATC, the pH or TDS or EC or Temp function can accurately read sample values over a wide temperature range from 32°F to 140°F. Effectively solve the problem of inaccurate measurements caused by liquid temperature changes. The water quality tester uses an advanced LCD backlit display design, which makes readings easier and clearer. The data is clearly visible even in the dark. This digital pH tester helps you know the water quality for drinking, bathing, a cup of salt water, swimming pools, etc. The digital pH tester also helps you get a clear overview of nutrient levels in hydroponic setups, garden soil, etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.