Used for testing the compressive strength of ordinary concrete in the range of 6 ~ 30Mpain structural engineering Brick rebound hammer is the equipment that one spring drives the impact hammer andimpacts the resilience of transient elastic deformation produced on the surface of sinteredcommon brick masonry or sintered porous brick masonry middle brick, so that thehammer drives the pointer to rebound and points the rebound distance. The reboundvalue is used as one of indexes of compressive strength of sintered common brickmasonry or sintered porous brick masonry middle brick to deduce the compressivestrength label of the brick. Because of the advantages in light weight, flexibility, low price, easiness to operate, non-damage, wide detection surface, convenient and rapid test, the concrete test hammer is widely used in practical engineering detection. Technical parameters Stretching length of bounce spring：75±0.3mm Operating length of elastic tension spring: 61.5±0.3mm Standard impact energy：0.735J Friction of the pointer slider：0.5±0.1N Anvil rate setting: 74± 2