OPERATION
• Remove the protective cap, turn the pHep® on, by sliding the ON/OFF switch on the top of the meter.
• Immerse it in the solution to be tested without exceeding the maximum immersion level.
• Stir gently and wait for the reading to stabilize.
• After use, switch the meter off, rinse the electrode with tap water and store it with a few drops tap water.
• Large differences in pH readings (±1 pH) could be due to lack of calibration or dry electrode.

MAINTENANCE
The sensor should be kept moist at all times. For this purpose, always keep wet the tissue inside the protective cap. In case of erroneous readings even after an accurate conditioning and calibration, the reference junction might be contaminated or clogged.

CALIBRATION
• Immerse the electrode in pH 7.01 (HI7007) buffer solution.
• Allow the reading to stabilize and with the supplied screwdriver, adjust the “pH7” calibration trimmer to read “7.0” pH.
• Rinse the electrode with tap water and immerse it into the second buffer.
• Use pH 4.01 (HI7004) if the solution to be measured is acidic (pH < 7), or pH 10.0 (HI7010) for alkaline samples (pH > 7).
• Allow the reading to stabilize and with the screwdriver adjust the “pH4/10” calibration trimmer to read “4.0” or “10.0” pH.