The Ectha PRO series rebound hammer for concrete allows for an analysis of on-site concrete quality in order to estimate the mechanical characteristics of the material. Investigations with the Ectha PRO rebound hammer are based on the surface "hardness" measurement of material expressed in terms of the "Rebound Index." Investigations with the Mechanical or Digital Rebound Hammer falls under the category of Non Destructive methods, as implementation of the testing, in addition to not causing damage to structures and building function, involves relatively low costs. The DRC rebound hammer is available both in the Ectha 1000 "Mechanical rebound hammer" version and in the Ectha PRO "Digital rebound hammer." Both models are supplied with KITs and accessories indispensable for proper investigation.