brand new and high quality Features: YY-400 /YY-400N is a newly developed high-precision multifunctional water quality tester, which has the functions of measuring the PH, ORP, hydrogen ion concentration, and temperature of the water. The automatic temperature compensation (0-60) measurement data is updated. Accurate, easy to operate, easy to carry, drinking plenty of water rich in hydrogen ions is good for health. 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 1. Display: LCD digital display 2. Backlight: optional backlight(YY-400: Backlight,YY-400N: No backlight) 3. Temperature: automatic temperature compensation 0-60 4. Working environment: 0-60 (32.0-140F); RH 5. Waterproof: Ip67 6. Automatic shutdown: 5 minutes 7. Data retention: value retention 8. Battery: 3*1.5V (LR44) (not including battery) 9. Screen size: 33 * 24mm 10. Size: 183"37*37mm(7.2*1.5*1.5in) 11. Weight: 90g Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1xDydrogen Ion Concentration Tester