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Prices take the piss a bit imo.
Prices seem about right compared with similar goods, i.e. down by a factor of about 10 in real terms since the first consumer version. You might as well say that $300 for a frame is taking the piss because it only contains $20 worth of CrMo steel.
You're not the first to notice that the incremental cost of making each extra PM once you have finished development and tooling up is <$100, but if you actually think you can get a reliable, accurate, precise PM to consumers for under $400 within the next year, stop posting here and get on with it because you'll make a killing.
Prices take the piss a bit imo.
Strain gauge with a radio. Less than £20 down Maplin/RS.