Alvin 247P metric scale. Pro-quality, triangular 30 cm metric scale is made from high-impact plastic with white, non-reflecting dull-matte faces, and tapered edges. Machine-engraved graduations and color-coded furrows. Graduated in 1:20, 1:33 1/3, 1:40, 1:50, 1:80, and 1:100. Alvin 247P metric scale is supplied with storage case. Made in Germany.