Gem Hardness Pencil Set with 5 Pieces of Standard Hardness Testing Pencils
Model Number: FMH-5

Hardness Pencil is used for scratching the rough gemstones. If there are scratches, the gemstone hardness is lower than that hardness marked on the pens.

Specifications:
1. Hardness: 5-9
(10 standards of gem hardness: talc-1; gypsum-2; calcite-3; fluorite-4; apatite-5; orthoclase-6; quartz-7; topaz-
8; corundum-9; diamond-10)
2. High quality.
3. Gift box package.
4. Packing dimension: 126x97x43mm.
5. G.W.: 0.5kg.

Applications:
Gemological labs, gemology schools/institutes, jewelry/gem industry, --etc.