Chinavision's Auto Detective Pen won't tell police about the dismembered prostitutes under the patio, but it will help you detect when a fake banknote is stuffed into your change.
More interesting, it also pulses with various colors to indicate the presence of different types of RF transmission, with degrees of sensitivity to permit fine positional isolation. Its Engrish blurb even says it "prevents most mobile phone interference," whatever that means. The FCC would surely love this little fellow.
Auto Detective Pen [Via Red Ferret]
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