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ADVANCED OPERATION: Not only do you get a reading
view any colour change
If it appears to turn light-and-dark it is doubly refractive
Pros: you can test rare coins (which must not be filed or stained with acid)
Hardness Pencils, set of 5 Options_Battery ADVANCED OPERATION: Not only doSummary 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
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