For the folks asking about batteries, I picked up some rechargeable Duracell and Energizer batteries. They tend to last at least a couple hundred rounds. The measured weights with the Energizers seem to bounce around a bit more but seem to resolve a bit more quickly. The Duracell are my preferred and while they may resolve the weight slightly slower they seem to last a bit longer and I trust the reading. To an earlier poster point, the measurements will start getting a bit squirrely when the batteries get low but I've found the low battery indicator to be reliable and come on before it gets to this point. Also, agreed on getting bits of powder down into the mechanism throwing off the measurements but with 5 minutes of familiarization with your check weight and how many grains it comes out to (both of mine have both been exactly 308.64) this gets noticed easily IME. I've been using these scales since 2012 and have been very impressed.