Concrete Test Hammers are also known as Swiss Hammers, Schmidt Hammers, or Rebound Hammers. They are versatile tools for assessing the quality of hardened concrete. Although commonly used to estimate in-place compressive strength, concrete test hammers can provide much more value. The complete evaluation of a concrete structure or pavement is about more than just strength. The hammers are portable and easy to use, and their long history of widespread use means that performance and results are well understood.