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Avio used to also sell pre-installed meters so Wiggle has probably just stolen the wrong blurb.
The calibration is meaningless if it's not done after the thing has been glued to a particular crank, and a quick search say these modules don't do anything at all until they've been setup with the app.
lots of other sites
I clicked through the first few listings on Google and they're all ghosts with no stock.
grams
motoko
It says in the description that they are calibrated within 2%, lots of other sites selling them for 150-200 which seems pretty harsh if they're useless