PRESIDIUM Multi-Tester III, User Handbook Manual

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2. PERFORMING A TEST with your Presidium Multi Tester III 

Place the tip of the probe pen against the gemstone and 

press the test button. Apply sufficient pressure on the tip 

for correct reading.

For mounted jewelry or gemstones: 

Hold the jewelry or gemstone with one hand and the  

tester with the other hand 

(Fig. 2.1).

 For proper 

operation of the tester, the thumb and index finger must 

always be placed on the metal-plated serrated part  

located on both sides of the tester at all times. Care 

should be taken when testing mounted jewelry. User 

must ensure that the stones are securely mounted before 

conducting a test as gap between stone and setting might 

lead to inaccurate reading.

Fig. 2.1

Fig. 2.2

For testing loose gemstones: 

Place the gemstone on the metal stone rest and hold the 

metal stone rest with one hand while holding the tester 

with the other hand 

(Fig. 2.2). 

Tips for using your Presidium Multi-Tester III

The probe tip must be placed at a right angle or 

perpendicular to the facet of the gemstone for an 

accurate reading.