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gillies
Sorry, that was a bit oblique.
What I should have said, is that you could wear out a chain in 4,000km (especially under race conditions), so you'd be wise to carry a spare or make sure you can buy one if needed.
Of course you might not think it's worthwhile carrying the tool and just change it after, say 2,000km.
That particular tool is more accurate than the more common types, as it only measures wear at one roller: the other type will have you changing your chain before it's needed (but that's better than too late).