+1
A regular old balance type scale is and always will be accurate, I can't say the same for even a very good digital. I have used good scales (not for reloading) from companies like Ohaus and Mettler and you really need to treat them right if you expect to get any accuracy out of them (constant temperature, no vibration, fresh batteries, etc...) Even then, they can and will go out of calibration and require maintenance from time to time.
I have an old Redding balance scale that I have had for 20+ years and it is still accurate to 1/10th grain after several moves, storage for 7+ years in an unheated shed, and being jostled around a ton.
I do exactly like s4s4u and set my powder dispenser to throw the load I want and weigh like every 10th or so charge.