Abstract: A screen printing device including a work table having a printing position with a holder to retain a substrate in the printing position, a holder for a screen provided with a mask, the mask having referenced portions, a microscope, an adjuster for positioning the table, screen holder and microscope, and further includes a template with reference portions corresponding to the reference portions of the mask, the work table having at least one hole with associated illumination means to simultaneously illuminate the corresponding reference portions of the mask and of the template held in the printing position by the holder in order to be able to adjust, with the help of the adjuster, the relative position of the reference portions of the template and the reference portions of the mask when viewed through the microscope.