Apparatus for measuring the surface hardness of building materials

摘要: An apparatus for measuring the surface hardness of building materials, having a housing comprising test hammer, driving spring and an impact pin, said hammer being moveable by means along path in to be brought against which measurement is placed on measured, further device rebound height wherein provided with optical pattern extending over at least part its length comprises detection unit arranged adjacently detecting evaluation circuit connected determine maximum rebounding upper end after impact.