Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) Zeiss loupes don't come with

Zeiss loupes don't come with a case

it also gives a wider range of reading

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

will test stones down to 2pts in size

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

Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) Zeiss loupes don't come withDetails 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.