Convenience use 5 seconds know the water quality, accuracy, faster. This Combo set of TDS PH EC Temperature. In addition, 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 for adjustment screwdriver, just complete the calibration with the calibration button automatic and buffer powders included. High accuracy The pH meter numbers range from 0.00 to 14.00 (PH), while the numbers of the digital EC and TDS meters range from 0 to 9990 ppm. The pH resolution is 0.01pH, the accuracy is 0.05pH. TDS: 0~9990ppm, the conductivity: 0~9990us/cm, the accuracy: 2%. Wide Application Ideal for pH testing at home and in the laboratory, including drinking water, electroplating liquid, boiler water, aquarium water, swimming pool water, photography rinsing fluid, well water, deep groundwater, aquaculture, food processing and more.