1. Provide the measurement of small aperture and narrow groove, and adopt antimagnetic design for the rotary part of the lower end. 2. Replaceable spring, wear resistance and durability, mechanical rotation measurement with non-magnetic, wear resistance, anti-static. 3. Photoelectric sound measurement. 4. Suitable for:Traditional machine tools, integrated processing machinery and so on, Weight: 0.77602716224 Pounds, Manufacturer: Gishbjka