Concrete Rebound, Test Schmidt Hammer, Polymer Resiliometer, Testing Equipment. Features: The Test Hammer Submit to Standard of GB/T9138-1988. 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. Specifications: Power: Electronic Model Number: HT-225B / HT-225 Usage: Cement Testing Machine Test Range: 10~60Mpa SR: 25mm+-1mm Size: 54*278mm Friction of Pointer Slider: 0.5N~0.8N Color: Will Be Sent Randomly 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 . 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.