Check the listing for details. Hot Selling Concrete Test Hammer N Type Rebound Hammer 2.207J for Construction. Condition: New. Listed at 199.99 USD. Product Description Standards and Regulations Applied - ISO/DIS 8045 International - EN 12 504-2 Europe - ENV 206 Europe - BS 1881, part 202 Great Britain - DIN 1048, part 2 Germany - ASTM C 805 USA - NFP 18-417 France - B 15-225 Belgium - JGJ/ T 23-2001 China - JJG 817-1993 China Application field Used for testing the compressive strength of ordinary concrete in the range of 10 ~ 60Mpa in structural engineering 1. Product features and advantages (1) Imported high-quality springs are more fatigue-resistant, aluminum alloy spring seat snap ring assembly (2) Adopt CNC machining center and other machine tools to refine the movement, and the rebound value is guaranteed. (3) Silicone bracket for soft hand protection, more comfortable rebound operation. (4) Finely grind the spherical zero-setting screws to make the rebound firing smoother and smoother. (5) Improved pointer design, easy to adjust friction and more stable. (6) Beautiful label and ruler are easy to read, and the hard oxidation treatment of the parts is beautiful and durable. (7) High-precision aluminum alloy flange is not easy to be damaged, and high-precision hook is not easy to be elastically empty due to abrasion. (8) Multiple original imported dust-proof components, cleaner movement and longer maintenance period (9) Abrasion resistance of super-hard 6061 aluminum alloy casing, and the button is not easy to fall off by stretching process. 2. Technical parameters Standard impact energy : 2.207 J Pointer length: 20.0 ± 0. 2mm Friction of pointer: 0.65 ± 0. 15N Spherical radius of bouncing rod: 25±1.0mm Elastic tension spring stiffness: 785.0 ± 30. 0N/m bounce hammer unhook position: Scale line "100" at the score line Operating length of elastic tension spring: 61.5±0.3mm Impact length of bounce hammer: 75±0.3mm Bounce hammer take-off position: Scale "0" Anvil rate setting: 80 ± 2 Calibration value on steel anvil: 80 ± 2 Company Information