Fangrui Product Details 1. Ph-2 Pro Litmus Tester Litmus Test Paper Color Change Ph Meter Water Quality Meter 2. The Main Function: 3. Reset Function: Press And Hold The Power Button For 3 Seconds In The Power-on State, And Then Release It, When The Screen Displays "----", The Reset Is Successful 4. Automatic Temperature Compensation Function: 0-80 Degrees Celsius 5. Power-off Data Storage Function: The Data Will Be Automatically Saved After The Battery Is Pulled Out, And The Storage Time Is One Month 6. Test Paper Function: The Color Of The Backlight Will Change With The Ph Value, Just Like Litmus Test Paper 7. Product Specifications: 8. Material: Pc + Abs Flame Retardant 9. Calibration Method: 3-point Automatic Calibration 10. Resolution: 0.01ph 11. Batteries: 2 X Lr44 Button Batteries (batteries Are Included In The Delivery) 12. Range: -2-16ph (usually 0-14ph) 13. Temperature Range: 0-80 Degrees Celsius 14. Dimensions: 15.5 X 3.2 Cm 15. Net Weight: 58 Grams