4 in 1 PHMeter: The PHMeterTDSMeter set is a very complete set for checking the pH/TDS/EC temperature of water quality. It is an ideal accessory for drinking water, swimming pools, aquariums, swimming pools, spas or laboratories. Water quality tester set includes: 6.86 pH buffer powder. 2, 4.01 pH buffer powderLCD display: the pH meter TDS meter kit is convenient to use, and simply immerse the pH meter and TDS. EC tester into the solution for a few seconds to quickly and accurately detect the water quality; and both instruments have a practical LCD screen to get a clear field of view. The green backlight ensures that you can read measurement results in all conditions even at night.Automatic calibration: PH meter TDS meter can be calibrated by touching buttons or by using calibration powder to create calibration solutions, so that it can be recalibrated at any time. They all have an automatic shut-off function that can extend battery life. Also includes the required batteries.Accurate measurement: the pH meter has a measuring range of 0.000-14.00, with high accuracy of 0.01pH. Measuring range: TDS is 0-5000ppm, conductivity is 0-9990s/cm, with high accuracy of 2%. ATC Function The movable glass hole automatically balances the water temperature and ensures accurate readings.Wide range of applications: water quality tester drinking water kit can be used in several areas: pure water production and drinking, tap water, well water, sea water, aquarium water, swimming pool water, amniotic fluid, etc. Very suitable for testing water, swimming pools, aquariums, spas, hydroponics, food, wine and beer making.Three in one TDS/EC/thermometer: For BMUT 3-in-1 TDS meter, press the "Hold" button to maintain the display, press the "Mode" button once for TDS frequency conversion and press the "MODE" button twice for the "C/ F" conversion.