With modern electronics scales the actual weight of the dumpster is not really important...just place the empty dumpster on the scale, zero it, and then fill with whatever. When scaling it, place it back on the scale and whatever you added to the dumpster is now displayed.
Thats the way a non ferrous yard I have dealt with does it. They have a couple of scales and the bins they use are generally partially filled with whatever the sort is...so if you got bare bright copper, they bring their partially filled bin out, zero it on the scale, let you toss in your lot, and put it back on the scale.
Seems to work well.
Jon.
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