These highly effective roughness comparator scales make visual surface finish assessment easy.  The Electro-deposited nickel steel plates are replicas of common  machining processes,  are very hard wearing and ideal to have in your pocket to act as the first line of roughness control. Simply hold against the machined surface being controlled, compare by eye and  draw your finger nail across the surface.

Scales cover all types of machining process and values and  are also supplied fully certified if requested