I know how to do that test. When I first put the 3-pot Nissin caliper on with sintered pads I took a test run, doing some bedding in braking. Got home and thought "I wonder how hot the rotor is?" It only takes a fraction of a second to get a badly burnt finger. And then just last week, I wondered how hot the header pipe was. That was much hotter.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge