Calibration
All testers have been calibrated during the manufacturing
process and no further adjustment or user intervention to
the unit is required.
Self-calibration should not be attempted. To minimize any
risks associated, users should contact Presidium at
service@presidium.com.sg or its service center for
assistance. In the event that users require the
manufacturer to re-calibrate the unit, the users will bear
the associated to/fro freight cost for the shipping of unit to
the service center.
Recommended testing conditions
The gemstone should be clean and dry before testing.
However, elaborate cleaning procedures are not normally
necessary.
The recommended testing temperature is 18°C – 27°C or
65°F- 80°F. Please allow the gemstone to adjust to room
temperature prior to testing. Exposure and/or operation of
the tester outside the room temperature would affect the
results and performance of the tester.
Battery information
Batteries generally can still be used, provided that the
“Low Batt” indicator does not light up.
Stop using the unit when the low battery indicator is
displayed to prevent inaccurate measurements.
Do not leave worn out batteries in the battery
compartment as the batteries may corrode, leak, and
damage the tester. Batteries should be removed when
the tester is expected to be stored for any extended
period of time.
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