Key benefits Accurate hole measurement: measures hole sizes with an accuracy of 0.1 mm, suitable for fine work. Simple, durable design: straightforward structure that supports long service life and reliable use. Fast, reliable readings: fully tapered design enables quick checks in professional environments. Materials and construction Material: quality metal for durability and extended service life. Precision construction: enables quick and easy measurement with consistent results. Design: the caliper/hole taper ruler is fully tapered along its length to facilitate fast measurement of tapered holes and cone shapes. Specifications Measurement accuracy: 0.1 mm Material: metal Fulllength taper: yes, designed to be fully tapered along its length for fast measurement Applications Metalworking and fabrication: quickly verify hole diameters during drilling, reaming, or finishing operations. Quality control: inspect machined parts to ensure hole sizes meet specifications. Tool setup and maintenance: calibrate fixtures, jigs, and gauges that rely on precise hole measurements. Use scenarios Before drilling a hole, check the target diameter with the ruler to ensure alignment with tolerances. During part inspection in a production line, verify hole sizes to confirm conformity to specs. When setting up a jig or fixture, use the tapered ruler to rapidly confirm hole and cone dimensions for proper fit.