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- Hardened stainless steel construction with satin chrome finish, for protection of caliper
- Sharp-edged upper jaws and rounded nib-style lower jaw faces, for accurate outer dimension (OD) and inner dimension (ID) measurements
- Raised sliding surfaces for preventing defacement and wear of scale graduations
- Fine adjustment carriage to precisely control upper scale movement
- Meets Federal Accuracy Specifications GGG-C-111B
