Hardness pencils; scoring pencil for hardness measurement, hardness grades 4-10; 1 package

Mohs' hardness determination method with hardness grades 4-10, set in metal tube, 130mm.

In the Mohs hardness scale of Friedrich Mohs, each degree of hardness is represented by a mineral. Each mineral in the hardness scale scores those that precede it and is scored by those that follow.

With these specially made handy pens you can now find out the degree of hardness very easily.

The pens are made in Saxony with real stones that are set in metal tubes. All pens are labeled and ready to use.

The pins have a length of 13cm and a diameter of 5mm.

The following minerals and hardness grades are included:

4 - Fluorite

5 - apatite

6 - orthoclase

7 - quartz

8 - topaz

9 - corundum

10 - diamond

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