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, accuracy: 2%. Wide applicationIdeal for testing of home and laboratory pH, including drinking water, electroplating fluid, boiler water, water in the aquarium, swimming pool water, photographic flushing fluid, wells, deep water table, aquaculture, food processing and more.