Measurement selection: Material 1: 8.9~95.7% (Hard wood such as Beech, Spruce, Larch, Birch, Cherry, Walnut and so on) Material 2: 7.1~80.0% (Soft wood such as Oak, Pine, Maple, Ash-tree, Douglas fir, Meranti and so on.) Material 3: 1.0~2.5% (Cement or Concrete plane, Plaster produce.) Material 4: 0.0~3.3% (Anhydrite plane) Material 5: 0.7~3.8% (Cement mortar) Material 6: 0.5~7.4% (Lime mortar) Material7: 0.0~23.4% (Bricks)