One that works! Hehe
When people refer to "Tournament Grade" they usually mean expensive! But that's not really the case. Generally, in my experience anyway, a tournament grade marker will be fast, reliable, and electronic (pretty much the cause for it being fast)! Don't really think there's many people using manual markers at tourney's.
If you're gonna be usin a marker for tourney's it should be reliable, last thing you want is something to go wrong when you're emptying your hopper in someone's general direction! Some people think that because they've paid £1000 for a marker, it makes it perfect for a tournament, never mind the fact that it breaks every 5 shots and you spend more time fixing it than anything else (not talkin about any markers specifically).
Also, it should feel right (unless your sponsored, then you can't complain!). If you don't feel happy with your marker then don't keep it. It's down to personal preference.
Anyway, that's my 2p!