Only use the AC adaptor supplied by Presidium, otherwise the polarity of the plug might not be suitable. Remove the AC adaptor from the inlet and try operating it with batteries. If the tester is operating normally using batteries, the AC adaptor is not working. If the tester is not working when using batteries, the tester is faulty. In the event that the tester is not working when using batteries, please send the unit to the authorized dealer nearest to you for repair.
a) Forming incomplete test loop
PMuT provides results by using both the electrical and thermal conductivity property of gemstones. Moissanite is conductive while diamond is not. Hence, it is important to place the stone on a metal tray and to hold the metal tray with one hand and the tester with another to form a complete electrical loop. Otherwise, moissanite will not be conductive and PMuT will register diamond.
b) Property of moissanite The uneven distribution of impurities in moissanite could also cause the above observation. Hence, try to take a few tests at the girdle and different locations on the table for better results.
PDMT/PMuT has a built-in metal detector. Whenever the probe tip touches a metal surface, an audible intermittent beep will sound. This is only applicable to mounted gemstones.
This is due to inadequate polishing and uneven surface of the stones.
Ensure that the protective cover is replaced by the cylinder before pressing the Display button. When the protective cover touches the aperture of the light ray and sensor, some light will be reflected and the 7-segment LED will display a reading.
This could be due to static charge on the surface of the meter. Use a wet tissue to wipe the surface of the meter to discharge the static electricity.
When heat is conducted from the probe tip to the stone, the meter indicates the heat conductivity of the stone. The reading falls once the heat saturates. It is advisable to place the stone on a metal tray (optional accessory) to enhance heat conductivity.
Always allow the stone to cool before subsequent tests.
Please refer to the figure below. For a given position of indicator, all the gemstones that fall along the indicator and within the white strip are possible gemstones. Please note that the readings will fluctuate. Kindly refer to item 1.
For the figure below, the possible gemstones are Tanzanite, Aquamarine, Quartz, Amethyst or Citrine.
Hold the stone with a Push Tweezers or place the stone on the metal tray (Optional accessory from Presidium).
Smaller stones conduct less heat from the probe tip. Hence, the readings displayed will be slightly lower. However, readings will still be within the reading zone.