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@Max
You can lay a decent ruler across the seat tube and try and sight it from the inside of the tube edges but you won't be able to tell a 27.0 from a 27.2
TBH I would buy a cheap Vernier gauge from ebay - I got a secondhand old fashioned Sheffield Chesterman engineers metal one (non digital) for about £5. Once you have one they are so useful for this and that...