PRESIDIUM DC709N, User Handbook Manual, Page: 18 / 138

3. READING TEST RESULTS on your Presidium Duo
Tester
The test results are indicated as follows:
• After pressing the probe tip on the stone for about 2
seconds, the indicator will reach its highest position,
then slowly fall back. Take the reading at the highest
position.
• The tester will provide all possible results on the
display.
• The Presidium Duo Tester should be used only to
confirm the identity of suspected gemstone.
• An example of reading the result on the meter is given
below:
When the indicator stops at the above position, the stone
tested may be Quartz, Amethyst, Citrine, Tanzanite or
Aqua, i.e., any stones that fall within the white strip that
the indicator passes.
• Metal Alert Buzzer: If the tip of the pen comes in
contact with the metal mounting of a stone, an audible
signal is emitted.
• Relatively low readings in the green zone must be
expected with very small diamonds.
• Based on the thermal test results, Presidium Duo
Tester can help distinguish between :
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