PRESIDIUM DC709N, User Handbook Manual, Page: 15 / 138

2. PERFORMING A TEST on your Presidium
Duo Tester
Place the tip of the probe pen against the gemstone.
Apply minimal pressure to fully depress the tip into the
probe pen for correct reading. This is to provide a steady
and constant contact made between the probe tip and the
gem stone.
When testing a loose stone, place the stone onto the
depression of protective cover and press the probe tip on
the stone. The test result will be displayed on the meter.
For mounted jewelry or gemstones:
Hold the jewelry or gemstone with one hand and the tester
with the other hand (Fig. 2.1). Care should be taken when
testing mounted jewelry. User must ensure that the stones
are securely mounted before conducting test as gap be-
tween stone and setting might lead to inaccurate
reading.
Fig. 2.1
For testing loose gemstones:
Place the gemstone on the metal stone rest and hold the
metal stone rest with one hand while holding the probe with
the other hand (Fig. 2.2).
Note: Metal stone rest is not provided by Presidium.
Fig. 2.2
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