As the name suggests, visual inspection or VT involves using the human eye or optical tools like borescopes, fiberscopes and cameras to detect surface flaws or discontinuities. It is one of the most common and inexpensive Ultrasonic Non Destructive Testing Equipment methods but can only inspect surfaces and structural items that are accessible. Advantages include easy setup and evalua... https://prachicmi.livepositively.com/ultrasonic-non-destructive-testing-equipment-non-destructive-techniques-for-quality-assurance-in-manufacturing/new=1