Measure maps the fast, accurate with Scalex MapWheel.
This is the perfect tool, specifically designed for quickly taking scale measurements from maps. Just select the built-in scale factor to match the map and roll the wheel of MapWheel. Whether in straight lines or along curves, just roll it along the route you want to measure and the distance is displayed instantly in miles, kilometers or nautical miles.
Uses two AAA batteries (Included). Protective Case is sold separately.