ALTANA Micro-Gloss Manual - Manual (Page 23)

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Calibrate
5.3 Calibrating standards
To ensure exact calibration, only original standards
from the manufacturer should be used.
These are calibrated against tested primary
standards. Their surface must not be touched and
must be protected against scratches. Due to
environmental influences, however, the values of
standards can change over the course of time even
if they are handled gently. For this reason, you
should have the calibration standards tested by the
manufacturer at regular intervals (we recommend
annually).
5.4 Checking standard
We recommend the regular use of a separate test
standard for control of test equipment. The
frequency of this verification depends on the
conditions of usage (for example monthly). The
gloss standards are integrated into an aluminum
guide in which the measurement device is
positioned exactly. Perform the measurement as
you would normally, for example in Basic mode. The
displayed measurement value must not deviate from
the value printed on the standard by more than one
unit. Otherwise you should check whether there is
dirt and dust on the high gloss standard in the
holder or test standard. If cleaning and recalibration
do not offer any improvement, please get in touch
with our Customer Service.