Over deze norm
NEN-ISO 20318-1 specifies classification, dimensions, quality and test methods for hand-held mechanical pencilss which hold and feed out a lead, and are used for general writing. It is also applicable to multifunction pens equipped with a mechanical pencil unit. However, those pencils attached to machinery instruments such as a plotter are excluded.
|Engelse titel||Mechanical pencils and leads for general use - Classification, dimensions, quality and test methods - Part 1: Mechanical pencils|