Als.com
Coghlan's Four Function Whistle
- Als.com$6.99Buy
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From Als.com
The Coghlan's Four Function Whistle is a multi-function piece of gear for survival in the outdoors. It encompasses a loud whistle, a compass for map reading or orienteering, a thermometer that accurately reads in both Fahrenheit and Celsius, and a magnifying glass for precise detail viewing. Its ability to attach easily to a zipper ensures it's always within reach.