PRESIDIUM PGI-TD5612 Mode D'emploi page 13

Gently rub the table of the gemstone against the tissue/
jewelry cloth (Fig. 1.5b).
Fig. 1.5b
If your stone is mounted in jewelry, please carefully clean
the stone (Fig 1.6).
Fig. 1.6
Operating Conditions
The gemstone should be clean and dry before testing.
Elaborate cleaning procedures are not normally
necessary.
Recommended Normal Operating Conditions
The recommended testing temperature is between
23°C – 27°C or 73°F – 80°F. Please allow the gemstone
or jewelry piece to adjust to room temperature prior to
testing. Exposure and/or operating the tester outside the
recommended testing temperatures will affect the result
and performance of the tester.
Operating under Extreme Conditions
In the event that testing is done outside the recommended
operating conditions, the tester must first be calibrated
under the same temperature setting as the testing site.
Please refer to Section 5 of this handbook for calibration
procedure. This calibration is done to ensure the accuracy
and consistency of the testing results.
However please note that the temperature conditions
should be kept between 20°C to 33°C.
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