The NDT Reference App is a free Android application developed by The British Institute of Non-Destructive Testing. It is based on the best-selling book "Mathematics and Formulae in NDT" edited by the late Dr. Ron Halmshaw. The app is designed to help NDT practitioners and students understand and use the formulae employed in NDT.

The app includes basic formulae used in radiography and radiology, ultrasonics, magnetic particle testing, and eddy current testing. The ultrasonics section contains some values for ultrasonic velocities for a number of materials. The app is prepared by members of the BINDT Technical Committee, ensuring the accuracy and relevance of the formulae provided. The NDT Reference App is an excellent resource for anyone working in NDT or studying NDT, providing quick access to essential formulae on the go.