Calibration:

1)PH

• Rinse the ph electrode first with distilled water,and suck it with filter paper(not included).

• Turn on the meter.Press the"EC/pH"button,choice the PHfor measuring.

• lmmerse the ph electrode in pH 6.86(0r pH7.00)buffer solution:gently shake the meter and wait

• for a stable display.

• Regulate the trimmer with the Screwdriver provided until display shows"6.86"("7.00)at buffer solution temperature of25℃.

• Rinse the ph electrode with distiled water,and suck it with filter paper(not included)

• lmmerse the pH electrode in DH4.01 or pH9.18(pH10.0) 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 calibration of the instrument's pH range is now complete.

Important:

1. The ph meter should be recalibrated under following situations:

2. The meter has been used for long time since the last calibration or use.

3. The meter has been used in particularly continual conditions.

4. The utmost accuracy is required.

2)EC