STADLR : Staedtler® Triangular Scale for Engineers
Triangular scale delivers precision and versatility—three sides with six different scales. Full divided: 10, 20, 30, 50, 50 and 60 parts to the inch. 12" long. White plastic. Ruler Type: Triangular Scales; Length: 12 in; Standard Scale: N/A; Metric Scale: N/A.
