In order to measure 0.01grain (gn) you need scales that state they measure 0.001 grams (g)
If you just get scales that measure 0.1gn then you could end up with a weight of say 7.99 or 7.91 both saying it's a 7.9gn pellet.
It's easier if you have scales that state they measure in grains, but you need to make sure you don't confuse gn with g.
In reality it's not yet demonstrated that weighing actually increases accuracy, it's just another thing to play with if it takes your fancy if you're trying for the nth degree.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep