What is before plating and after plating of plug gauges?

Before plating, plug gauges undergo processes such as machining, heat treatment, and surface preparation to ensure they meet specified dimensions and tolerances. After plating, the gauges are typically subjected to final inspections and testing to verify their accuracy and surface integrity, ensuring they are ready for use in quality control and measurement applications. Plating enhances their wear resistance and corrosion protection, extending their service life.