90 Degree Precision Electronic Stainless Steel Boring Special Caliper Inner Diameter Measurement Tool Aperture Digital Caliper ,Easy to Use

Full metal shell, IP54 protected high-speed chip, the ruler slides smoothly and feels comfortable in the hand. Tighten the screws to lock the measurement value at any time. The serial number is engraved on the tail of the product for measurement and testing. 4CR13 stainless steel material, high hardness and corrosion resistance. Material hardness can reach above HRC55 The ruler body is precision ground and the measuring surface is ground. The parallel error of both sides of the ruler body is 0.005mm The two-way shockproof movement has an all-metal bezel. The movement adopts a double gear and double hairspring structure, which has a long service life and good shockproof performance. The scale adopts engraving, the scale is clear, and the engraving is engraving 4 times, so the engraving will never wear out.