混凝土回弹仪.木箱精包装,数值精度高.出口产品.Thisproductcompletelyconsistentwithnationalandindustrytechnicalspecificationandstandard asfollows:ASTMC805,BS1881:202,NFP18-417,DIN1048and UNI9189.Specifications: Nominalkineticenergy:2.207J; Stiffnessofstriketensionspring:785 40(N/m);