PRESIDIUM Multi-Tester III, User Handbook Manual

13

Fig. 2.3

Tests should be conducted on the table of the gemstone. 

In the event of any doubt, kindly test on the girdle of the 

gemstones instead.

For proper operation of the tester, fingers must be placed 

on the rubber pads located on both sides of the tester at 

all times.

To achieve optimum accuracy for tests involving very 

small mounted gemstones (1.2 mm exposed diameter 

and below), it is extremely important that no contact is 

made on any mounted/ metal part of the jewelry piece. 

The test results will likely result in confusion, as metal 

is highly conductive and results may indicate that a 

Moissanite is detected instead. 

To achieve optimum accuracy for tests involving very 

small gemstones (10 points and below), it is important 

to allow the gemstone to cool down before subsequent 

tests.

It is advisable to take multiple readings if any doubt exists 

regarding the test results indicated.

Cleaning the probe tip 

Please  note  that  if  the  tester  is  being  used  for  the  first 

time, or if the tester has not been used for a week, it is 

advisable to clean the probe tip using a piece of paper to 

attain a consistent and accurate reading. 

•    Ensure the unit is switched off. 

•    Hold the probe pen with the pen tip forming a 

     right-angle (90-degree) with any paper or stone rest  

     (as provided). Gently move in a  circular motion without 

     retracting the tip 

(Fig. 2.3).

•    Repeat the same motion several times. The cleaning 

     process is completed and the tester is now ready for 

     use.