A collection of technologies that provide a means of assessing the integrity, properties, and condition of components or material without damaging or altering them. NDT methods include ultrasonic testing, eddy current testing, radiography, thermography, visual inspection, magnetic particle testing, dye penetrant testing, acoustic testing, and others. Synonymous with non-destructive examination (NDE).

Tip excerpted from: The Professional's Guide to Maintenance and Reliability Terminology by Ramesh Gulati, Jerry Kahn and Robert Baldwin