I have two Lyman balance beam scales. When reloading shot shells I set my universal charge bar with the balance beam scale. One for shot, one for powder. After the bars are set I periodically check the charges for a few boxes of shells against the scales to make sure I am getting consistency and accuracy.
Rifle Cartridges for years I weighed each charge with the balance beam scale. Several years back I bought an RCBS charge master electronic scale. It works very well, and has proven against the balance beam scale to very accurate in dropping consistent charges. Being a little distrustful of electronic equipment I still check the RCBS electronic scale against the Lyman. So far the RCBS charge master has always been agreeable with the balance beam. I am also the same fella who has a state of the art hand held GPS, and knows how to use it. But I don't go out the door without a good old fashioned quality conventional orienteering compass, as it does not rely on batteries or has electronic chips and circuit boards, which can fail.