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The difference is consistent - always 4%. Without lab testing you couldn't claim the Vectors or the Rotor were telling the truth... maybe they're both wrong. Either way it doesn't really matter, I just want it to read the same as my Kickr.
Also, the Inpower was second hand on ebay for a steal, I doubt Rotor would be much help.
Or just complain to them? They say it should be +/-2 %.