The non-destructive UCI test method (Ultrasonic Contact Impedance) as well as the Leeb test method enable fast and mobile measurement as a supplement to the classical hardness test. Due to the compact measuring probes and sensors of the SONO series, the devices can also be used in difficult test positions and with complex component geometries. Fields of application are e.g. incoming goods inspection, mix-up testing, production control, quality assurance, weld seam testing, cut edge testing, maintenance on installed components as well as the replacement of dynamic hardness testers for small material thicknesses (below 50 mm, e.g. boilers, tubes).

In the UCI method, the entire contact area of the Vickers diamond is used in the calculation of the hardness – (not only the diagonal or the diameter as in the classical hardness measurement). Consequently, this method is also characterized by a lower susceptibility to unsymmetrical asymmetrical test indentations. The method is standardized according to DIN 50159 and ASTM A1038.