Since the late 1980s, Frank Rinn’s name has been inextricably associated with the RESISTOGRAPH®, the world’s first hand-held measuring unit that precisely detects the inner condition of trees and wood. Other non-destructive measurement techniques for material testing have been developed by Rinntech, in particular for concrete and other building materials. Five research and innovation awards: 1989, 1992, 1997, 1998, 2004.