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dealers use it to charge you an hour labor
they hold the device (which looks like an old palm pilot or a speed-gun) to each tire as the car communicates with the device...kind of freaky actually lol
but if you find out where to buy one please do share: i change tires sets twice a year for the seasons and therefore have to recalibrate each time (since i made the wise...hmm.. decision to pay extra for tpms on ALL the sets)
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