This baseplate compass features two U.S.G.S. Scales (1:24,000 and 1:62,500), a 1/16th inch scale, and a 4x magnifier. Other features include a liquid-filled capsule with a jeweled bearing, a self-cleaning capsule attachment, and a declination correction scale. Azimuth graduations in 2° increments. Lanyard and instructions included. 2-3/16” x 4-1/16”. Fits Fire Weather Instrument Kit (PEC SFF3090).