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3. Press the ZERO key. If no error messages appear, your unit is
calibrated. (For a description of error messages see "ERROR
MESSAGES" section).
Note: The 0.0 screen will remain until a sample is measured or
the power is turned off.
4. Gently absorb the ZERO water standard with a soft tissue. Use
care not to scratch the prism surface. Wipe off the surface
completely. The instrument is ready for sample measurement.
Note: If instrument is turned off the calibration will not be lost.
CALIBRATION PROCEDURE 11
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