==== pH METER====

1. Press the “ON/OFF” button to switch the tester on.

2. Dip the electrode about 2 to 3 cm in to the test solution. Stir and let the reading stabilize.

3. Note the pH value or press “HOLD/ENT” button to freeze the reading. To release the reading, press “HOLD/ENT” again.

4. Press “ON/OFF” to turn off tester. If you do not press a button for 8.5 minutes, the testers will automatically shut off to conserve batteries.

5. Dip in distilled water after use.

**pH CALIBRATION**
  -Calibration should be done regularly, preferably once a week. 
  -Calibrate using 2 to 3 standard buffer solutions.
  -Press “ON/OFF” button to switch unit on.
  -Dip electrode about 2 to 3 cm in to the pH standard buffer solution.
  -Press the CAL button to enter calibration mode. The CAL indicator will be shown. The upper display will show the measured reading based on the last calibration. While lower display will indicate the pH standard buffer solution.
  -Allow about 2 minutes for the tester reading to stabilize before pressing the “HOLD/ENT” button to confirm the first calibration point. The upper display will be calibrated to the pH standard buffer solution and the lower display will then be toggling in between readings of the next ph standard buffer solution.
  -Repeat with other buffers if necessary. Rinse electrode in tap water before dipping in the next buffer.