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 degrees). PH meter No need adjustment screwdriver, just complete the calibration with the calibration buttonautomatic and buffer powders included. High Accuracy The 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, accuracy:2%. Wide ApplicationIdal for home and laboratory pH testing, including drinking water, electroplating liquid, boiler water, water in aquarium, swimming pools water, fluid rinse aid for photographs, well water, waterdeep water table, aquaculture, food processing and more.