ST20M pen meter is factory calibrated, and requires calibration every week for both pH and
conductivity.
Be caution when using this function if you are not familiar with the conductivity pen meter.
• Press the On/Off button to turn on the meter, and then press the Mode button to switch to
conductivity mode. Press the CAL button to enter into calibration mode, the "CAL 1413/12.88"
will be shown, and "CAL" is blinking.
• Rinse the electrode with pure water (distilled water) and dip it into 1413 μS/cm or 12.88
ms/cm buffer.
• When the "CAL" disappears, this indicates that the calibration is finished and the pen meter
goes into measurement mode.
Clean the electrode and cover with the protective cap after each use. Be sure storage solution is
not dry in the cap.
Harsh samples such as sticky, dirty or oily liquids may shorten the life time of the pen meter.
The meter uses 4 (1.5V AA) button batteries. Replace all batteries when the display fades or
does not turn on.
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