Signal Mirror
A signal mirror is a compact, highly reflective device used in survival gear to signal for rescue by reflecting sunlight towards aircraft, ships, or rescuers.
Estimated value as of 2026 · Source: Average from current retail listings like Army Surplus World ($8.99), Red Rock (…
Fun Fact
Military-spec signal mirrors like MIL-M-18371E can signal up to 40 miles on a clear day, far beyond what the naked eye can see.
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