Accurate and Precise: The pH meter and TDS are equipped with high quality titanium alloy probes and automatic temperature compensation (), ensuring accurate readings at different temperatures.< p>Combination of multi-function pH meter: enjoy quality, precision and speed in 5 seconds. This combo pack contains TDS PH. Professional 4-in-1 pH meter, TDS meter, meter and thermometer. With calibration function to ensure measurement accuracy. Auto-off function: The digital TDS meter and digital pH tester have an auto-off function, which automatically shuts down when idle to save battery power. The digital TDS meter features a backlit display, allowing you to read quality results more accurately. Auto-calibration: The auto-calibration feature of the pH pen and TDS pen almost fits instantly to water temperature and pH readings. Also, you can use buffer powder to calibrate the tester by pressing the button. Uses: Indoor/outdoor pH tester, suitable for many occasions, such as drinking, wine, juice, Aquariums, hydroponic systems, spas, swimming pools and systems are easily portable. This can happen if the TDS level is very low. Therefore, the initial recommendation is to analyze your product and determine its overall quality and chemical composition.