You also have to be careful as to what size scale is used when weighing at the yard. When we weigh our nonferrous metals here, on our state certified scales, it's on a 5k limit scale, and its tolerances are +/- x% of your weight. When I took our box truck onto their truck scale, and offloaded our pallets of densified al cans, and then got back on the scale, the weights were in their favor 300lb on a 3200lb load. I made them take my pallet loads and weigh them on the small scale, and sure enough, their little scale was within 4lbs on a 1600lb pallet load from ours. Now, if it had been copper, and I didn't catch it, and it was like 6-7 years ago- that'd been a lot of money. Every scrapyard buying ferrous/nonferrous metals will have a smaller scale for their walk-in customers.
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