Scientific apparatus for testing surface strength; scientific apparatus for testing surface stiffness; scientific apparatus for testing surface hardness; scientific apparatus for testing soil strength; scientific apparatus for testing soil stiffness; scientific apparatus for testing soil hardness; scientific apparatus for testing the surface strength of artificial sports playing surfaces; scientific apparatus for testing the stiffness of artificial sports playing surfaces; scientific apparatus for testing the hardness of artificial sports playing surfaces; scientific apparatus for testing the surface strength of natural sports playing surfaces; scientific apparatus for testing the stiffness of natural sports playing surfaces; scientific apparatus for testing the hardness of natural sports playing surfaces.;