Fangrui Product Details 1. Portable High-precision Ph Test Pen Ph Acidity Meter Ph Water Quality Detection Instrument 2. Series: Portable Ph Test Pen 3. Working Temperature: 0-60 Degree C 4. Measurement Range: 0.00-14.00ph 5. Resolution Accuracy: 0.01ph 6. Battery: 2x1.5v (lr44) Button Batteries 7. Calibration Method: (4.01 6.86 9.18) Three-point Calibration 8. Scope Of Application: Domestic Water, Food Ph, Aquarium Water Quality, Aquaculture And Other Fields 9. Features: Highly Sensitive Measuring Probe, Automatic Temperature Compensation Function, Three-point Calibration Function, Automatic Calibration Function, Easy To Use, Large Screen Display 10. Product Accessories: 11. - 1xph Test Pen 12. - 1xph 4.01 25 Degree C Ph Buffer Powder 13. - 1xph 6.86 25 Degree C Ph Buffer Powder 14. - 1x User Manual 15. - 1x Packaging Box 16. Product Size Weight: 15.5x3.1x1.7cm 49g 17. Note: Some Customers Report That The Product Has Data Jumps, Which Is Normal. (when Using This Product: After Being Placed In Water, The Data Will Change Slowly From The Last Decimal Point, This Is Because The Ph Meter Needs To Adapt To The Test Environment. The Data Will Be Stable For About 1 Minute When It Is Still, And This The Final Test Data. In Addition, If The Water Surface Shakes, The Data Will Also Jump, So The Test Must Ensure That The Water Surface Is Still.)