Huntington MG2 Black Military Bearing / Lensatic Compass, Professionally Liquid-Dampened, Full Metal Body with Bearing Prism / Lens System (K4580 BL US) Military bearing / lensatic compass in full metal body with folding cover Prism lens system enables you to get your directions from the side: 2nd scale on the side of the fluid-damped compass disc Lens system diopter-adjustable