Our reliable mechanical Concrete Tester HT-225A is used for non-destructively measuring the resistance of a reinforced concrete structure. The greater the resistance of the concrete, the greater the rebound impact. By comparing the values as indicated in the diagram labeled on the Tester. The compressive strength can be found in Kg/cm2. Instruction Manual and Abrasive Grinding Wheel are available with the Concrete Tester, and Anvil-17(17kgs) for calibrating Hammer is optional.