"In addition, you must calibrate this tester whenever the following happens:
If the tester was used or lay aside long time; recalibrate it
It was used too often; recalibrate it
Need High Accuracy. recalibrate it
Note: You will Need calibrate after you get it.
Specification:
*Measuring pH Range: 0.0 - 14.0 pH
*Resolution: 0.1 pH
*Accuracy: ±0.1 pH (at 20°C/68°F), ±0.2 pH
*Operating Temperature: 0 - 50°C (32 - 122°F)
*Calibration: Manual, 1 point
*Relative Humidity: *Life: Approx.700 hours of use
*Size: 152mm x 30mm x 15mm (5.9x1.2x0.6"")
*Trimming: By potentiometer
*Battery: 3*1.5v (AG-13 button battery) (included)
*Net Weight: Approx. 57g (after installed batteries)
Package:
1 x pH meter
1 x screw driver
1 x instruction manual ( English)
2 pouches of calibration buffer solution (4.0 & 6.86)
3 x AG 13 button cell batteries (included)
The way of Calibrate:
Immerse the electrode in pH6.86 (under 25°C) standard buffer solution of phosphate, and gently shake the electrode.
"

• This digital pen style pH meter is an ideal instrument for anywhere you may need to test pH levels.
• Very accurate and durable. Measuring pH Range: 0.0 - 14.0 pH. Resolution: 0.1 pH.
• Accuracy: 0.1 pH (20C), 0.2 pH. Operating Temperature: 0 - 50C (32 - 122F).
• Size: 6" x 1" x 5/8";
• Meter comes with protective plastic case, PH 4.00 and PH 6.86 buffer solution, and calibration screwdriver

This digital pen style pH meter is an ideal instrument for anywhere you may need to test pH levels.Seesii