ECCA T4
Scratch Hardness Tester TriForcePencil Model 293
Pencil hardness test according to Wolf-Wilborn, including 17 pencils, 6 B – 9 H, with 3 force settings: 5 N, 7.5 N, 10 N
Pencil hardness test according to Wolf-Wilborn, including 17 pencils, 6 B – 9 H, with 3 force settings: 5 N, 7.5 N, 10 N