Coghlans 4-Function Whistle 879504. This piece of Survival Gear from the professional survivalists at Coghlans includes a whistle a 2-scale thermometer a magnifier and a compass making it the tool you'll want to have with you in the wilderness. For an amazing way to ensure your complete survival in the great outdoors choose the Coghlans 4-Function Whistle. Features of Coghlans 4-Function Whistle: Whistle 2-scale Thermometer Magnifier and compass Metal spring-loaded clip for versatile attachment options Package Contents: Coghlans 4-Function Whistle 879504 Coghlans 879504: 4-Function Whistle