Surface testing concrete test hammer, also called a concrete rebound hammer or Swiss hammer, is used for non-destructive measurements of surface hardness. Employs mechanical rebound test method – no digital components. Kg/cm2, psi, and MPa conversion tables on the back of the instrument and in the user manual. Manufacturer calibrated – ISO calibration certificate available as an option (see accessories) Ideal for use in construction, structural engineering, and material strength testing. Optional test anvil to verify accuracy listed under accessories.