Digital Schmidt Rebound Hammer is a non-destructive testing instrument used to assess the compressive strength of concrete structures. It measures the rebound hardness of concrete by impacting the surface with a spring-loaded hammer and then determining the rebound distance of the hammer. This is commonly used in construction projects, quality control of concrete structures, and assessment of the integrity of existing concrete elements. Digital Schmidt Rebound Hammer operates on the principle that the hardness of concrete is related to its compressive strength. Moreover, this testing instrument also includes built-in sensors to measure the rebound distance accurately.