A reduced visual showing aid which is used in making wood board 400 x 280 x 13 mm with matt white surface, mounted on elastic feet conveys a circular scale with four quadrants 0 - 90º graduated each 2º, with two lines at right points.. The beam box is given with openings to suit metal slits, colour filters, lenses and so on., and is fitted with a 12V 24W line filament.
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