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<p>[QUOTE="John Burgess, post: 5266184, member: 105098"]from what I know with scales performance, there's a difference between "precision" and "accuracy". I'm not a scale scientist, but apparently scales by design are generally accurate, but not precise. my warehouse scale for instance, 1 pound = 16 oz. However when a weight something that's 315 pounds, I might get 5001 oz or 5049 oz, but it will still read 315 pounds and so would other peoples freight scales. </p><p><br /></p><p>It's why the scrap yards have to have their scales constantly checked and certified, because simply switching out scales for something more in their favor will benefit them, and cause problems with people looking to scrap metals when the weights are way off. Their scales must be precise and they buy scales designed to be precise and verify it regularly. </p><p><br /></p><p>the question really is, can you weigh the same item over and over again and get the same exact measurement every time or does it bounce around a little. if it bounces around a little, it's accurate, but it's not precise.</p><p><br /></p><p>there's other factors, like dust or dirt weight, air pressure weight, uneven surfaces causing weight shift. even calibrating in an area, then using it in a different area, it's not going to be precise after the calibration because it was calibrated to the specific conditions it was in when calibrated after moving it it will be off because conditions changed.[/QUOTE]</p><p><br /></p>
[QUOTE="John Burgess, post: 5266184, member: 105098"]from what I know with scales performance, there's a difference between "precision" and "accuracy". I'm not a scale scientist, but apparently scales by design are generally accurate, but not precise. my warehouse scale for instance, 1 pound = 16 oz. However when a weight something that's 315 pounds, I might get 5001 oz or 5049 oz, but it will still read 315 pounds and so would other peoples freight scales. It's why the scrap yards have to have their scales constantly checked and certified, because simply switching out scales for something more in their favor will benefit them, and cause problems with people looking to scrap metals when the weights are way off. Their scales must be precise and they buy scales designed to be precise and verify it regularly. the question really is, can you weigh the same item over and over again and get the same exact measurement every time or does it bounce around a little. if it bounces around a little, it's accurate, but it's not precise. there's other factors, like dust or dirt weight, air pressure weight, uneven surfaces causing weight shift. even calibrating in an area, then using it in a different area, it's not going to be precise after the calibration because it was calibrated to the specific conditions it was in when calibrated after moving it it will be off because conditions changed.[/QUOTE]
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