I know that someone will be along shortly to tell you that everything Lee has ever made is absolute crap,
but the Perfect Powder Measure is actually pretty good. It might be the best with extruded powders.
Some tips:
If it leaks fine ball powders, lap it with some grinding compound. Just enough to eliminate any low spots.
Give the innards a squirt of graphite.
Tighten the screw on the side until it the cone is hard to turn, then back it off just a c hair.
Operate it the same every throw, either let it just kiss the stop or slam into the stop, but do it the same every time. This goes for most measures.
As for a dispenser/scale combination, they start at about $300.