A typometer is a ruler which is usually divided in typographic points or ciceros on one of its sides and in centimeters or millimeters on the other, which was traditionally used in the graphic arts to inspect the measures of typographic materials. The most developed typometers could also measure the type size of a particular typeface, the leading of a text, the width of paragraph rules and other features of a printed text.
A typometer is a ruler which is usually divided in typographic points or ciceros on one of its sides and in centimeters or millimeters on the other, which was traditionally used in the graphic arts to inspect the measures of typographic materials. The most developed typometers could also measure the type size of a particular typeface, the leading of a text, the width of paragraph rules and other features of a printed text.
Source: Wikipedia "Typometer" · CC BY-SA 4.0
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