Wear MateriaL: Concrete test hammer body is made of excellent stainless steel material, rustproof, wear resistant, possess high elasticity, fall resistantAccurate And CleaR: The friction between the pointer shaft and the pointer slider is uniform, the index is accurate and clear, and the label is easy to read and understandApplicable Scenario: Concrete test hammer can be used to test the concrete strength of building wall, roads or bridges, not applicable to tile or brick wallPortable And Stable: The rebounded hammer tester is lightweight and portable. The internal excellent spring has good resilience and is , better the productComplete Accessories: The package include test hammer, grindstone, portable case, springs, screwdrivers, washer, etc. easy for you to install and useSpecification:Item Type: Concrete Test HammerMaterial: Stainless steelNominal Energy: 2.207JFriction Force of Pointer: 0.5-0.8NRadius of Spherical End of Impact Rod: Approx. 25mm / 0.98inStiffness of Impact Spring: 7.85N/mWorking Length of Spring: Approx. 61.5mm / 2.42inSteel Anvil Calibration Value: 80±2PackageList:1 x Concrete Test Hammer1 x Sandpaper2 x Spring2 x Screwdriver1 x Washer1 x Storage Box1 x Storage Case