1. BS1881:Part 201:1986 - Guide to the use of non destructive methods of test for hardened concrete
2. BS1881:Part 203:1986 - Recommendations for measurement of velocity of ultrasonic pulses in concrete
3. BS1881:Part 207:1992 - Recommendations for the assessment of concrete strength by near-to-surface tests
4. IS 13311 : Part 1 :1992 – NDT of Concrete – Method of test - UPV
5. IS 13311 : Part 2 :1992 – NDT of Concrete – Method of test – Rebound Hammer