A professional-quality plastic triangular scale. Precision sharp engraved graduations. Black matte finished plastic. Precision engraved white graduations.

NOTE: Unless otherwise specified, triangular scales are 12 in. English or 30cm metric with divisions according to the following standard graduations:

ARCHITECT’S: 3/32, 3/16, 1/8, 1/4, 1/2, 1, 3/8, 3/4, 1 1/2, 3 in. to the foot; one edge divided to 16ths.

ENGINEERS: 10, 20, 30, 40, 50, 60 parts to the inch.