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Home in on hot spots with the WiFi Signal Locator. This tiny gadget (no bigger than a car key) locates WiFi hot spots, so you can logon and work. Point the locator in different directions and like a modern-day divining rod, it sniffs out signals, then lights up. One bar of LED light for a weak signal and four bars for a strong one. Cost: $30 (at www.mobileedge.com).