There are a few things that one must realize using the laser thermometers. Because IR emissivity values are different for different surfaces, you should always take a reading at the same spot/area at each hub. Color affects the reading as does chemical makeup.
Also, the area that is "read" gets larger as you are farther away. Stay close to your target. Most IR thermometers have a scale on them somewhere showing the target to distance ratio. So stay close. You don't want to skew your readings with a cooler part getting read.
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