Hardness Pencils, set of 5 Magnification_Over 10X you must understand the limitations

you must understand the limitations of any tester you buy

02ct) so if the stone is small

Inset lens (6X) about 2 inches

the slightest layer of grease on the stone (e

this exactly what you see

Hardness Pencils, set of 5 Magnification_Over 10X you must understand the limitationsSummary 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