Alumicolor Select-a-Scale are an ultra convenient and functional drafting tool that allows architects and engineers to select multiple scales all in one product.
The unique design incorporates a sculptured arch on the bottom for ease of movement. A rotating rod on the top displays one of six available scales while the solid aluminum base has fixed scales on the front as well as a raised inking edge.

Fixed Scale: 32nds

Rotating Scale: 1/16, 1/8, 1/4, 1/2, 1:1, 2:1