Pacific Arc Economy Triangular Scale Ruler 12" Mechanical Engineer
Triangular scale made from high-impact plastic. Machine-engraved graduations. Mechanical drafting scales have the following graduations: 1/8, 1/4, 1/2, 1" to the foot; 1/4, 3/8, 1/2, 3/4 to the size; 50ths and 16ths.