Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) it works on nickel providing

it works on nickel providing the nickel hasn't be processed with a coating

Backlit display with lots of information

Moissanite in the multi-testers)

will test stones down to 2pts in size

Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) it works on nickel providingDetails 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.