The latest is a natural progression from the "hot-spot-finding version isn't based solely on paranoia.)," which warns when you're in the vicinity of a wireless signal that could be used to operate a spy cam or other surveillance equipment. (Chinavasion makes both devices, but at least the
Using two button cell batteries, the pen has four LED lights that indicate the strength of Wi-Fi signals up to 30 meters away, according to 7Gadgets. And you can even use the pen itself to write down the best locations. How analog.