[onehitwonder]

anyone use this scale..I have to constantly rezero it out and I noticed the longer I leave something on it the more it will weigh

[cougar1717]

I have known it to bump a tenth of a grain the longer it stays on the scale. But it could be as simple as making sure no air is blowing out of the vents in your house. Even slight changes in air pressure can affect digital scales. If you calibrate it and it still does not hold zero, I'd contact RCBS.

[D. Manley]

There's a few things that can cause that, mine does the same on occasion. I've attached a great set of tips (.PDF format) for electronic scales provided by Lee Love...worth a read.