Made of high-strength carbon steel, chrome plated; markings never fade Provides an accurate measurement reading between two graduation markings on a linear scale; Increase resolution and reduce measurement uncertainty/human estimation error Industrial accuracy, all according to international standards Commonly used to measure bore size, inner / inside diamaters Measure Range: 0.4-6 inches / 9-150mm; Resolution: 0.02mm; Only metric mm reading available Specification: Measure Range: 0.4-6 inches / 9-150mm Resolution: 0.02mm Material: Carbon Steel Package Includes: 1 Piece Inside Groove Vernier Caliper Note: Metric reading.