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PH Calibration:lmmerse the electrode in pH 6.86（pH7.00）standard buffer solution of phosphate,and gently shake it 。
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.
lmmerse the electrode in a PH4.01 or PH 9.18 buffer solution,gently shake the electrode and waiting for the reading to stabilize.The showing value and buffer solution's ph value is within error range.
The calitbration of the instrument's pH range is now complete.
Power Supply:3*1.5V(AG13) (Not inculde)。
