Concrete Rebound Tester. Features The Test Hammer Submit to Standard of GB/T9138-1988 and JJG817-93 and JGJ/T23-2011 and ASTM C 805. HT-225B Concrete Test Hammer is Applied to Test the Compressive Strength of Building Concrete Components, Bridge and So On. Center Rod is Made from Imported Material, High Accuracy and Durable Resistance. The High Polymer Material in Order to Perfect Protect Instrument from Damage and Extend Use Life. Pointer Slider is Outside Structure, Its Friction Can Be Balance Well and Easy to Be Adjusted So That We Can Make Sure That the Instrument is Accurate. Compared with Other Suppliers in the Line of Business, the Product is More Accuracy, Good Quality, and Best Price and Longer Use Life. Specification Test Range: 10~60Mpa Standard Impact Energy: 2.207J(0.225Kgf.m) Stroke of Rebound Hammer: 75mm Friction of Pointer Slider: 0.5N~0.8N Sphere Radius of Rebound Pole SR: 25mm1mm Average Rebound Value on Steel Anvil Rm: 80±2 Size: 54*278mm Weight: About 1.2Kg Package Includes: 1* Concrete Rebound Tester . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.