This is how I get around the certified scale issue if I want to buy by weight. I carry a scale in the truck and obviously it's not certified.



Somebody wants to sell me a bunch of scrap and wants .10/lb. I tell the I'm going to weigh the stuff on my scale. They're welcome to watch if they want but it's just for my own purposes. I'll be offering the $xxx for the pile. I weigh it and it comes to 450 pounds. In plain sight, I figure (450).10= $45. I tell him "I'll give you $45 for the pile". Weight is never mentioned.