Measuring magnifier
A measuring magnifier is a tool that consists of a detail magnifier and a permanently installed measuring scale in the form of a ruler . Its simplest form is the foldable thread counter .
Instead of a scale , transverse scales or geometric figures ( circle , rectangle , triangle ) etc. with defined and known dimensions are also possible.
The measuring scale can be attached to a glass or metal plate (see also: graticule ).
The magnifying glass is usually guided displaceably in a tube . This enables an adaptation to the individual ametropia of the user and the optimal setting of the magnifying glass for a sharp image of the scale, which is brought into a plane with the object to be measured.
The tube can be opaque, transparent and / or provided with a lighting device. This depends on the area of application.
Application examples
- All cases in which objects are to be measured or checked that are difficult or impossible to detect with the naked eye due to their size
- Measurement of the line width of barcodes
- In typography, measurement of font sizes
- Archeology , biology , precision mechanics , forensics , photogrammetry , philately etc.
Warning notice
Like all magnifying glasses, the measuring magnifier can also cause fires, see magnifying glass # warning .