SH 3000 pencil hardness tester
According to Wolff-Wilborn
For the determination of the resistance of coated surfaces.
This pencil hardness tester is placed on the coating under test and moved forward for several millimeters (see the standards). The hardness is determinated of the both hardness degrees between writing and intrusion.
- Hardness tester with pencils of 17 hardness degrees from 6B to 9H