The PH meter adopts a function design, which can measure PH, ORP, H2 and temperature with high precision. All-round measurement of water quality to healthy water quality. High-sensitivity glass probe, the pH meter uses a three-point calibration to calibrate the electrode to pH 4.01, pH 6.86 and pH 9.18 solutions to the accuracy of your measurement. The automatic shutdown function turns off the power after 5 minutes of inactivity to save power. Adopt fully transparent liquid crystal (LCD) to display 4-digit value and corresponding physical quantity unit. Wide range of applications: Portable PH meter can be carried with you, very suitable for home and laboratory pH testing applications, including drinking water, swimming pools, aquariums, hydroponics, laboratories, etc. PH range: 0.01-14.00 pH 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: 1C/F Accuracy: 0.5. Material:ABS colour:As shown Package Contents: 1 x Water quality detector 3 x PH testing powder 1 x English manual Only the above package content, other products are not included. Note: Light 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.