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Rapid Rules are an ingeniously simple improvement over the flat and triangle scales. It's unique shape instantly identifies the scale edge. Simply rotate the scale rod to locate the needed scale. Once located, it is retained...ready-to-use, every time you pick it up. All six scales read from left-to-right and read only one scale at a time.
Staedtler Mars Engineer Triangular Scale. 12" triangular scale in Staedtler's professional series is ideal for engineers. Color-coded grooves in the high-impact polystyrene plastic ensure quick and accurate selection of the desired scale. Three sides with six different scales feature die-engraved graduations. Engineer triangular scale is fully d...