6
CALIBRATION
Before beginning the calibration procedure, locate the two
calibration solutions and keep them close to the meter. If
the calibration is not performed quickly, the meter will return
to test mode and the calibration will not hold. While this
does not damage the meter, the calibration will have to be
performed again.
1. Remove the 0NTU and 100NTU bottles from their
protective cases. Tighten both caps and shake the bottles
gently to ensure they are properly mixed.
2. Clean the outside of both bottles to ensure there are no
fingerprints on the glass. Fingerprints or dirt on the glass
will alter the readings, so it is critical to handle the bottles
by the cap from this point on.
3. Turn the meter on.
4. Press and hold the
TEST/CAL
button until CAL appears
on the screen.
5. Let go of the TEST/CAL button. The screen will display
0.0, prompting for the 0NTU standard solution. You will
have 20 seconds to perform the next step or the meter will
exit calibration mode and return to test mode.
