Natural obsidian test stones give precise readings when testing for gold purity. Obsidian is a volcanic glass produced when lava becomes cold. It is been used for years to make the sharpest knives. Obsidian test stones, on the contrary to rougher test stones, have a perfectly smooth surface that provides more consistent and reliable readings.
Size: 6 x 3 x 3/4
Transline - Natural Obsidian Test Stone
- Brand: Transline
- Product Code: gt36
- Availability: Out Of Stock
- $25.50
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$20.40
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