4 measuring utilities: external, internal, depth, and steps.

Hardened stainless steel hardness HRC48-52 and close type sliding scale structure design.

Solid structural design with precision machining, chrome plating surface, laser engraved scale, guarantee wear resistance.

Ergonomic design curved pusher, external and internal jaws for easy to use and safety.

Unique, innovative groove-design of main scale, for eliminating dust and grease, reduce sliding friction resistance.