Easiest thing is just to do a ramp test, 3min blocks at 25w increments on each power meter (using the Kickr's power as your reference). Then you can check offset as well as slope.
Would you record one on say trainer road and one through your head unit?
Yeah that would work okay as long as you can download the file off trainerroad to compare. Or just use two Garmins
@GoatandTricycle started
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Easiest thing is just to do a ramp test, 3min blocks at 25w increments on each power meter (using the Kickr's power as your reference). Then you can check offset as well as slope.