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Amazon.com: BIJIA Multifunctional Sighting Compass for Hiking,Metal Military Waterproof High Accuracy Lensatic Compass with Clinometer and Bubble Level for Hiking, Climbing, Boating, Exploring, Hunting, Geology : Everything Else
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Should a Compass Have an Air Bubble In It? - The Hiking Authority
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Should a Compass Have an Air Bubble In It? - The Hiking Authority