The quality of concrete is mainly judged by its compressive strength directly affecting the load bearing capacity and durability of concrete structures. TC-3028 / TC-3030 Concrete Test Hammers (Schmidt Hammers N Type Economy / Standard) are used to measure the compressive strength characteristics of hardened concrete non-destructively, control uniform concrete quality and detect weak spots in the concrete. The test object should have a minimum thickness of 100 mm (3.9 in). TC-3030 is supplied complete with plastic carrying case, grinding stone and an instruction manual. TC-3040 Calibration Anvil, manufactured from a special steel alloy, is used for the calibration of concrete test hammers. TC-3040 weighs 16 Kg.