PRESIDIUM PGI-TD5612 Mode D'emploi page 27

5. CALIBRATING your Presidium Gem Indicator
All testers have been calibrated during the manufacturing
process and usually no further adjustment or user
intervention to the tester is required.
However in situations as stated below, calibration will be
warranted:
i. Existing probe tip becomes bent/broken and needs to
be replaced with a new probe tip,
ii. You have repeatedly gotten an inaccurate result
against a known gemstone
iii. Testing under extreme temperature conditions (See
section under "Operating Conditions")
To begin calibration, you will need to first remove and
re-insert the probe tip or replace with a new probe tip.
Removing and Replacing the Probe Tip
Turn the probe tip anti-clockwise to remove the existing
probe tip (Fig 5.1a).
Fig. 5.1a
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