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I use one to do a quick check on the wheel/tire temps when we stop at rest areas or other stops. All I'm looking for is a tire or wheel that is drastically different than the other three. This could indicate a problem such as a dragging brake pad or whatever. If all four are in the same temp range then I feel all is ok. After a few times of checking the tempuratures you get a feel for what should be normal for your rig. It only takes a minute or two to check the tire temps.
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