Liniaturomierz

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A linear gauge -

It is made of transparent foil with a pattern of convergent thin lines or concentric arcs, and a scale.

Readings are made after applying the ruler to the tested surface in the (most comfortable) location with the average raster value, using the interference phenomena between the ruler pattern and the pattern of the underlying raster. Clearer interferences show up when you find the right angle for experimentally turning the lying linear gauge. Interferences can be of different shapes, eg concentric circles or concentric crosses. Since the interference is also a multiplier and a divisor of two, you must guess which value is on the scale. Also keep in mind that in practice, the linetype for each of the component colors may have a slightly different value (which is related to the optimization of the raster array to weaken the moiré).

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