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My arm isn't long enough to indicate how far over my head most of that was
He was making roughly the same point I made earlier - if you have a good accurate standard, you can only need a precise measuring instrument, and cheap ones are fine for that. The stuff he was doing was way above any normal cyclist's requirements, and probably budget too as it's hard to find even a modest set of metric slip gauges for under £100
My arm isn't long enough to indicate how far over my head most of that was so I'll probably just go for another cheap digital caliper and be satisfied at that!