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The RF35 Advanced Fish Finder Watch enables fisherman to know the water temperature and features a fish alarm. You can buy it here for $140. Via Red Ferret.
Most fish finders are either handheld or affixed to a boat, but this floating sonar sensor attaches to your line (it weighs a mere 1 oz.) and has an operating radius of 75, transmitting real-time views of fish to the display unit you wear like a watch. The sensor reads water depth up to 100, and its ultra-wide 90 sonar beam covers wide swaths of water to help you find the perfect spot to fish.
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