Feature: 1. The vernier caliper is made of stainless steel, with high hardness and corrosion resistance, and can protect the measuring scale from abrasion. 2. The ruler body is processed by laser, and the scale surface has clear lines to ensure the accuracy of the measurement. 3. The vernier caliper has a bright measuring surface, has a certain anti-iron filing function, and is not subject to too many restrictions when used. 4. With a fine‑tuning roller design, which can be supported by the thumb, and the operation is smoother and more stable. 5. The vernier caliper has a wide measuring range and is suitable for measuring the outer diameter, inner diameter, hole depth and step size of the workpiece. Specification: Item Type: Vernier Caliper Material: Stainless steel Measuring Range: Approx. 0-150mm / 0-5.9in Resolution Value: 0.02mm How to Use: Take the reading of the external measuring surface as an example. First find the 0 scale line of the secondary ruler, read the main ruler scale on the left, find the place where the main ruler and the secondary ruler scale are completely aligned, read the reading of the secondary ruler, and finally follow the precise reading formula "Main ruler reading + secondary ruler reading x secondary ruler accuracy = accurate measurement value" just read the value.. Package List: 1 x Vernier Caliper