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.
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.
Diamond rings usually have a small hole on the inner part of the ring. In this case, use the jewelry attachment included with your Presidium gauge. This jewelry attachment will fit through the hole and touch the bottom tip of the diamond.
The ring is not securely fastened. For regularly-shaped rings, take note of the width of the ring and use the appropriate self-centering jaw. Use the red self-centering jaw for narrower rings and the blue one for wider rings. Ensure that the ring is securely fastened by using the chucking knob.
The letters are distorted due to excessive pressure exerted on the level. Do not push the level all the way down, as the engraving diamond will sink too deeply into the metal surface during engraving.
As a rule of thumb, push the level down lightly until it reaches a point where the level comes to a stop. At this point, the engraving diamond is at the surface of the ring. Exert slightly more pressure and start engraving. Practice makes perfect!