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ISO 3058:1998
M00009218
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ISO 3058:1998 Non-destructive testing -- Aids to visual inspection -- Selection of low-power magnifiers
standard by International Organization for Standardization, 03/01/1998
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This International Standard specifies the characteristics of the following types of low-power magnifiers 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:binocular, normally with a long working distance (Type C.1);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).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-mount rests on the surface of the object to be examined (this includes magnifiers provided with any form of graduated scale for the purpose of measurement);plastic lens sacs, liquid-filled;magnifiers intended for the examination of internal surfaces.1) The distinction between bi-ocular viewing and stereoscopic viewing is defined in annex A.