Alleyopper makes an excellent point about the overhead lighting ballast interference. I use strictly the RCBS 750 model (in fact have two of them) and have no problems whatsoever, unlike some comments I've read on this blog. The key I've found is to use a power surge protector (with no other items plugged into the power surge protector), making sure the overhead lighting is a distance (mine overheads have ballasts and are 4' above my reloading table) above the scale (no desk lamps immediately above the loading table) and no direct wind (such as a fan of any sort) that affects the air flow near the scale. Extreme temperatures also affect thes scales, all the above because these scales are that sensitive. But boy are they accurate.