This article explores the advanced testing equipment used in CNC lathe turning for quality assurance. It comprehensively covers technologies such as coordinate measuring machines, optical measurement systems, non-destructive testing methods, surface roughness testers, and in-process monitoring tools. Emphasizing essential practices like machine calibration and workflow integration, it highlights how these sophisticated methods ensure precision, durability, and adherence to stringent manufacturing standards, supporting global manufacturers in achieving superior CNC lathe turning outcomes.