Description Staedtler Mars 12" Triangular scale is made of High impact polystyrene plastic,color coded for added durability and easy reading. Triangular scale has three sides with six different scales that feature die-engraved graduations is ideal for engineers. Three sides with six different scales Engineer scale with regular grooves Engineer - Full divided: 10, 20, 30, 40, 50 and 60 parts to the inch Easy-to-read white plastic Equivalent to Alvin 111P in graduations
