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14. Always perform a single point calibration with pH7 first before performing the second or third
point calibration.
15. After each successive second and third point calibration, the 'percentage of slope' % reading will be
displayed. This is an indication of the condition of the electrode. If the % reading shows 100%, it
means the electrode is in good condition. However, if the % reading is below 70% or above 130%, then
the electrode has deteriorated and should be replaced.
4 TAKING A pH MEASUREMENT
1. Switch on the unit
2. Rinse the electrode in water then shake the unit dry with a snap motion as shaking a mercury
thermometer.
3. Dip the sensor into test solution, shake to remove bubbles.
4. Once the reading stabilises, a reading is established.
5. Press the Hold button once to freeze the display, press again to release it for another reading.
6. Always rinse the electrode before and after each test.
6
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