[DrStalker]

Is that why new self checkout systems are immensely frustrating, but after a few months they're fine to use? I'd assumed that the tolerances were lowered because too many customers were getting so frustrated that they were refusing to use them.

[qeorge]

Yes, but they have to recalibrate them every so often and they get overly sensitive again.

Problem is, every time it beeps at you and the cashier overrides it, it averages your item's reported weight with the ones its seen before. So if a cashier is overriding it all the time (as tends to happen with constantly beeping things) the weights drift off, and the whole thing is quite useless.