Calibration discs for Gemtest-PGI More sophisticated diamond gauges For the professional jeweller: Sl1

For the professional jeweller:  Sl1 and Sl2  diamonds will probably read correctly (but not guaranteed

check it with a diamond gauge

Externally

Our probe only lasted 3 months

Calibration discs for Gemtest-PGI More sophisticated diamond gauges For the professional jeweller: Sl1Details Spare calibration discs for GEMTEST PGI. The Gemtest PGI must be calibrated regularly to ensure it is working properly, especially if the temperature changes. This is not difficult: you place the probe on of the circles and press a button, then place it on the other circle and press a button. The only problem is: if you've lost the calibration discs.