Portable energy trace

The portable energy trace (or P.E.T.) is a device made for detecting energy readings and identifying their sources.

Fiction

Marvel UK Generation 1 comics

While Grimlock and Sludge were rampaging in Doonstown, Optimus Prime sent Bumblebee out in the area to find how Sludge made it from California to Doonstown. To detect any curious energy readings, Bumblebee brought along a portable energy trace. After personally detecting a strong energy signal, he used the P.E.T. to identify it as an Autobot shuttle. Dinobot Hunt!