Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) ) usually register as Moissanite

) usually register as Moissanite

it also gives a wider range of reading

Zeiss loupes don't come with a case

Battery included

Good working distance (enough space to work with both hands on the lower magnifications)

Calibration discs for Gemtest-PGI Magnifier Style_Reader (handheld) ) usually register as MoissaniteDetails 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.