Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) 10X12 - 10X13 - 10X14

10X12 - 10X13 - 10X14 - 10X20* - 10X21 - 10X21 - 10X23 - "30X21”

Backlit display with lots of information

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

- can also be powered with a USB cable (supplied)

will test stones down to 2pts in size

Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) 10X12 - 10X13 - 10X14Details 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.