Convenience use 5 seconds experience water quality, accuracy, faster. This Combo set of TDS PH EC Temprature. Besides, it has the best price, reliable quality, all make it your first water quality test. Automatic humanized design Automatic temperature compensation automatically accounts for temperature changes ( 0~80 degree). PH meter No adjustment screwdriver needed, just complete the calibration with the auto calibration button and included buffer powders. High Accuracy PH meter numbers range from 0.00 to 14 .00 (PH), while the EC and TDS digital meter numbers range from 0 to 9990 ppm. pH resolution is 0.01pH, accuracy 0.05pH.TDS: 0~9990ppm, conductivity: 0~9990us/cm, the accuracy: 2%. Wide applicationIdal for home and laboratory pH testing, including drinking water, electroplating liquid, boiler water, water in aquarium, l water from swimming pools, photographic flushing fluid, well water, deep ground water, aquaculture, food processing and more.