Originally Posted by fishboat

This is the one I used:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

At some point you have to trust something. I trusted the scale tolerance claims as I think it's close enough for my use. Accuracy typically suffers most when you're at the edge(as in use for calibrating a wheel tensiometer) of its max weight rating (600 lbs). But again..the accuracy should be fine for this use. I looked for a scale with a lower max weight(200 lbs would have been nice) and didn't find much. In a lab or to check a scale used to sell goods x weight NIST certified weights are a good path, and required in many industries(to obtain industry certifications).

https://www.mcmaster.com/products/te...t-certificate/