Measuring devices, measuring apparatus, measuring tools, measuring machines and measuring instruments in particular for measuring shafts, crankshafts and camshafts, measuring lengths and coordinates, measuring dimensions, with one or several axes, for industrial or scientific purposes, for gage monitoring, for manufacture, assembly, dimensional metrology, quality assurance, machine tools, optical, opto-electronic, tactile, mechanical, electromechanical, electrical, electronic, manually-contro...