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@hippy
The gold standard is a bit of a marketing crock. Most of the high-end power units tested with similar degrees of accuracy and if you forget to zero the SRM you're screwed without doing stupid corrections.
2% in real world situation is basically impossible to actually ride at as the swings you can notice are greater than that and if you're using it on a turbo then you're using the same device so it's +- 2% either way all the time anyway (unless you have an old P2M that temp creeps).