SAN FRANCISCO (09/22/2003) - When you use Wi-Fi on the road, you have to boot up your notebook to see if you are within range of a signal. Enter Kensington Technology Group's US$29 WiFi Finder, a credit card-size device that checks for a usable 802.11b or 802.11g wireless signal in your location. A red light means no signal; a single green light, a weak one; and three green lights, a strong one. In my tests, however, recognition was erratic.
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