YY-400 / YY-400N is a new high-precision multifunctional water quality tester, which has the function of measuring the pH, ORP, hydrogen ion concentration and temperature of the water. The measurement data of automatic temperature compensation (0-60 ℃) is updated. Accurate, easy to use, easy to carry, drinking plenty of water rich in hydrogen ions is for health. It is suitable for pH, ORP, hydrogen ion concentration and temperature testing applications of household and laboratory water, including swimming pools, ponds, beer, kombucha, aquariums, hydroponics, laboratories, food processing, etc. 1.PH Range: 0.01-14.00pH Resolution: 0.01pH Accuracy: ± 0.05pH 2.ORP Range: ± 999mV Resolution: 1mV Accuracy: ± 2mV 3.H2 Range: 0-2400ppb; 0.001 to 2.400 Resolution: 2ppb; 2 ppm Accuracy: ± 10ppb; ± 10 ppm 4. Temperature Range: 0.1-60.0°C 32.0-140°F Resolution: 1℃/°F Accuracy: ±0.5 Size: 183 x 37 x 37mm Material: Plastic Color: Black + White Package Contents: 3 x Digital Pool Water Tester Only