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The Aristo TZ triangle is a transparent indication triangle with special characteristics, because with its divisions it is at the same time yardstick, parallel-ruler, something to hatch, a protractor and plotter
for right-angled coordinates and polar coordinates. It is from age-resisting highly transparent plexiglass and among other things is used in lighting engineering and medical technology.
The strokes are stamped by a low coinage into the material.