This number, converted by the correlations available on the hammer, gives the compression resistance value in respect of the impact angle.
Impact Energy 2.207 Nm
Supplied with abrasive stone to prepare test surface
Rebound value indicated on test hammer
Rebound value chart on body, for quick calculation of compressive strength
Curve selection on chart dependant on testing angle
The concrete hammer, often called a rebound hammer, is supplied with plastic carrying case, grinding stone and instructions manual.