Mike,
It's 'Kart Genie', they advertised on UK karting a while ago, ref. selling sets of very accuratly measured jets, using some sort of alternative method that microscopically - laser measured the complete area of the jet hole / oval. Also it cost the individual no more than buying a decent set of pin guages - i couldn't find a reasonably priced set of pin guages.
I have spoke to KG, they seem like genuine people, whom said their sets give no performance advantage, just they are a linear set that gives you predictability when you change jet.
Probably none of the jets are actual size as the marking, but that doesn't matter so long as the size / flow is linear or predictable.
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