YY-400 / YY-400N is a newly developed high-precision multifunctional water quality tester, which has the function of measuring PH, ORP, hydrogen ion concentration and water temperature. Automatic temperature compensation (0-60) measurement data is updated. Accurate, easy to operate, easy to carry, drinking a lot of water rich in hydrogen ions is good 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; 0.001-2.400 Resolution: 2ppb; 2ppm Accuracy: 10ppb; 10ppm 4. Temperature Range: 0.1-60.0C 32.0-140F Resolution: 1/F Accuracy: 0.5 size:183 x 37 x 37mm Material:plastic colour:Black+white Package Contents: 1 x digital pool water tester Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.