Sper Scientific 850037 Large Display Conductivity Pen - Manual (Page 37)

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Although the values differ less than 30%,
the 22 uS is still over the range limit. The
maximum input value is 19.99 uS.
Example 2:
Standard: 1.6 mS; Detected value: 2.1 mS
Adjustable range: ± 0.63 mS (2.1*30%)
Although the measured value differs less
than 30%, the 1.6 mS is still less than the
10% range limit (1.99). The maximum
input value is 1.99 mS.
9. When “CAL” stops flashing on the LCD,
press SET for less than 1 second to
confirm the value. The pen will return to
Measurement Mode. To exit Calibration
Mode without saving, press SET for
more than 2 seconds. This allows you
to retain the pen’s previous calibration
data for the current range as you
proceed. If “CAL” flashes on the LCD
continually, check that the calibration
solution is stable and that the input
value (Step 8) is correct.
10. Repeat Steps 1-9 for other ranges
as needed.