This International Standard specifies the characteristics of the following types of low-powermagnifiers and gives recommendations for their selection for the inspection of surfaces.—Single-element magnifiers of magnification typically up to ´4 (Type A).—Multi-element magnifiers of magnification typically up to ´10 (Type B).—Twin-system magnifiers of magnification typically up to ´15 (Type C), categorized as follows:a)binocular, normally with a long working distance (Type C.1);b)bi-ocular1), including those refined with stops or other attachments, for quasi-stereoscopic vision(Type C.2).—Concave-mirror magnifiers with front-surface reflectors in powers typically up to ´6 (Type D).1.2 This International Standard is not concerned with:—watch-makers' loupes and spectacles;—single-element, spherical- or cylindrical-lens magnifiers in which either the lens or the lens-mountrests on the surface of the object to be examined (this includes magnifiers provided with any form ofgraduated scale for the purpose of measurement);—plastic lens sacs, liquid-filled;—magnifiers intended for the examination of internal surfaces.