GT-7034-P
Intersection Marker

It is used to have the graphite pencil draw markers to compare with color scale (option item - prepared by users themselves) to determine its concentration grade. The design of this tester complies with GB/T 149-1995 clause 5.5. (note: The concentration for the graphite pencil is distinguished into 18 grades as 6B, 5 B, 4 B, 3 B, 2 B, B, H B, F, H, 2 H, 3 H, 4 H, 5 H, 6 H, 7 H, 8 H, 9 H and 10 H.