I buy my produce "just in time", so I'm frequently using those scales to be sure that I've purchased as close to exactly what I need as possible for what I'm making that day. I don't want leftover produce.

For example, I made two apple pies the other day. The recipe calls for 2 lbs of apples each, so I bought 5 lbs of apples (to account for the weight loss from coring and peeling).