High  Accuracy Waterproof pH Meter
SPECIFICATIONS
Range:            0.00 to 14.00 pH
Resolution:         0.01 pH
Accuracy (@20°C/68°F):  ±0.02 pH
Typical EMC Deviation:   ±0.01 pH
Calibration:        Manual, 1 point,
Temperature Compensation Automatic:  0 to 50°C
Environment:    0 to 50°C (32 to 122°F);RH max 95%
Battery Type:    4 x 1.5V alkaline
Battery Life:    approx. 200 hours of use
Dimensions:    152 x 30 x 21 mm(5.9 x 1.2 x 0.8")
Weight:          53 g

PH Calibration
1. Immerse the electrode in pH 6.86(pH7.00) standard buffer solution of phosphate, and
Gently shake it.
2. Allow the reading to stabilize and with a small screwdriver turn the calibration trimmer
Until the display shows "6.86"("7.00"). Rinse the electrode with distilled water, and suck it
with filter-paper.
3. Immerse the electrode in pH4.01 or pH9.18(pH10.0) the standard buffer solution of borax.
4. after about one minute, until the display shows "4.01"or "9.18"("10.0").