Non-destructive is a testing technology based on applied physics and is exactly what the name implies method of testing materials for cracks or flaws without damaging or altering their physical structure. The complex products and new materials that are developed today and introduced in the market need freedom from defects and assurance for trouble free performance. Appropriate non-destructive inspection provides such vital assurance by determining the existing state or quality of materials with a view to find out its acceptance for intended end-use and supplements destructive testing assuring that all materials employed meet the required quality standards and are reliable.