Alvin 742PM triangular metric drafting scale. Professional-quality, 30cm Alvin metric scale is made from high-impact plastic with white, non-reflecting dull-matte faces, and tapered edges. Hot-stamped graduations and color-coded furrows. Graduated 1:100, 1:200, 1:250, 1:300, 1:400, 1:500. Hard plastic case included with Alvin 742PM metric scales are quality-made in Germany.