Do you forgot that evic have an amp limitation? If the evic is in the amp that he canthandle is pretty accurate, if you setup something on the higer amp he can handle is obvious he stays under,, make your ohm laws calculation and you will see.
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I'm not going to calculate it all. The point is that if some-one is vaping below 5 watts or above 9 watts then there's difference compared to a more accurate pv. With an rba at LR there will be a difference too, pretty much at any watts. It vapes ok, its just about comparison. I have a version 1 Zmax that isn't accurate because it doesn't have RMS. It vapes fine, but I can't compare those settings with an accurate pv. With the later version Zmax I can because it has RMS. That's all I'm saying - its for cross comparison purposes.