Schmidt’s Rebound Hammer

This is a commonly adopted equipment for measuring surface hardness. It consists of a spring control hammer which slides on a plunger and is housed in a tube. Once the plunger is pressed against the surface of the concrete, the mass behind the spring rebounds. After impact, the spring control mass rebounds and takes the rider along the guide scale. Based on the position, the reading is taken. Considering the reading and the calibration, the actual strength can be determined.