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Invest in some good vernier calipers. Don't go digital unless you're spending serious money
Cheap digital ones are good enough for anything a normal cyclist needs to measure
gbj_tester-
Probably but I'd rather have a cheap manual set personally. Or even a good manual set. My manual mitutoyo's are so much better than the dreadful ParkTool ones and cost less (although second hand on ebay).
Although admittedly they both do the job. But then a £250 Halfords bike 'does the job' but we don't buy them.
tallsam
How much is 27.2 too big? I've had steel frames at 27.0 but very little that wasn't 27.2.
Invest in some good vernier calipers. Don't go digital unless you're spending serious money though. But don't get the cheapest manual ones either.
In a pinch a ruler should give you a better idea.