Just remember being digital DOESN'T necessarily make it more accurate.  A (cheap) digital and a (cheap) spring scale both have the ability to be way off.  Weigh your scale with known weights to verify it.  A gallon of water is a pretty good starting point.  Depending on a few variables, a true gallon of water weighs about 8.3 pounds.  if your scale is lbs/ounces, that's roughly 8/5  

Just remember being digital DOESN'T necessarily make it more accurate. A (cheap) digital and a (cheap) spring scale both have the ability to be way off. Weigh your scale with known weights to verify it. A gallon of water is a pretty good starting point. Depending on a few variables, a true gallon of water weighs about 8.3 pounds. if your scale is lbs/ounces, that's roughly 8/5

x 2

Excellent advice.

Or...weigh free weights in a plastic grocery bag.

8-)