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Emyr-
But still more than you can read on the side of a tester. Anyway, the point of arm numbers is to be able to identify people as they come towards you, for example to decide whether to turn them or let them do another circuit in a 12 or 24. I find them pretty pointless for timekeeping, it's easier just to clock everybody and then scrub through the ones who turn out to be nuns on their way to chapel after they have gone past.
gbj_tester
If you actually believe that, you need to assist your local timekeeper. When people are flying past at 30mph, you can't read anything which is written on their side.