TWW Digital PH Meter

Operating Instructions

1. Remove the protective cap.

2. Rinse the electrode with distilled water.

3. Turn the meter on by pressing the ON/OFF key.

4. Dip the pH meter electrode into the test solution. (glass probe should be completely submerged)

5 Stir gently and wait approximately 30 seconds for reading to stabilize.

6 After use, rinse the prob tip with distilled water and replace the protective cap.

Calibration Instructions.

1. Dissolve each packet into 250ml (~8.453 oz) of distilled water. For the most accurate calibration, each calibration solution should be at 25C (77F).

2.Turn on pH meter.

3. Dip electrode into the pH 6.86 solution.

• Press and hold "CAL" (calibration) button for 5 seconds and release.
• The display will be flashing 6.86.
• When display stops flashing rinse with distilled water

4. Dip electrode into the pH 4.00 solution.

• Press and hold "CAL" (calibration) button for 5 seconds and release. Then immediately after releasing press the CAL button ONE more time.
• The display will be flashing 4.00.
• When display stops flashing rinse with distilled water

5. Dip electrode into the pH 9.18 solution.

• Press and hold "CAL" (calibration) button for 5 seconds and release. Then immediately after releasing press the CAL button TWO more times.
• The display will be flashing 9.18.
• When display stops flashing rinse with distilled water