Hardness Pencils, set of 5 Magnification_Over 10X press a couple of buttons

press a couple of buttons

5x 200mm 3

and you can click on each stone to see more information (constants)

you can carry it around the country (if you wish) and use it anywhere for buying precious metals by weight

a 'real' strip will set off the buzzer

Hardness Pencils, set of 5 Magnification_Over 10X press a couple of buttonsSummary Set of five hardness pencils. Each 'pencil' has a tip of a different hardness from No. 5 to No. 9 on the Moe scale of hardness (see 'Further Information'). Is it easy to use? Yes. See which will scratch your sample and which will not. Limitations Hardness varies from sample to sample, and it can also be different in different directions. These are for testing minerals, e. g. out in the field. They are not suitable for use on cut gemstone