yes you will.It's only 9 quid for 100 balls I think.
Another thing I'm wondering though, if I go and do it at an outdoor TopTracer now I'm only going to get winter yardages aren't I? But I suppose you can still get the gaps on a relative scale.
if its only 50 and its on a proper Trackman i would do it if you really don't know how far each club goes.
i did mine with my ball of choice on a grass practice ground with a lazer