Silva Spike Jet Zoom Compass MSThe Spike Jet Zoom baseplate compass features a large magnifying lens, rotatable housing with 360Deg graduation markings, extended orienteering lines and a grip friendly surface. The Spike Jet Zoom features a detachable scale slider at the tip and comes with 3 separate scale sliders that can be flipped to give a total of 6 different scales to choose from: 1: 40 k, 1: 7. 5 k, 1: 10 k, 1: 15 k, 1: 3 k, 1: 4 k. The stencil holes for start and control