This kind gent seemed to know a thing or two about the 4iiii PRECISION power meter. Multi-channel, super accurate >99%, left/right/both options, 200 hours battery and US$400+sales tax (GBP TBC probably 350-400 inc VAT). Is it any good though? (It’s glued to the inside of a flat non-carbon crank)
99% accuracy sounds pretty good to me!
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