... strength: slab,column,beam,truss. Nondestructive concrete testing instrume HT-225A Concrete Test Hammer Detail informationSpecifications: ModelHT-225ANominal kinetic energy2.207J(0. ... .78N(50-80g)Mean-value of steel-anvil rating of concrete test hammer80+/-2StandardsISO/DIS 8045, EN 12504-2, ENV 206 ... 15-225, JGJ/T 23-2001, JJG 817-1993Dimension60x280mmNet weight1kg Concrete Test Hammer