I did an experiment before putting my tackle away for the winter. I took my three fish scales, and used a 2.5, 5, and 10 lb dumbbell to compare weights. Surprising (or not) the results were all different. The 5lb weight weighed 3.8 lbs on one scale, 4.7 on another, and 5.2 lbs on the third scale. The closest to accurate was my digital scale ranging + - 2 oz. The other two spring scales were off by as much as 1.5 lbs, which led me to realize that the biggest flounder I boated last year was actually closer to 7.5 lbs and not 6.5 lbs . I never understood why the state record program was so strict about weighing the fish, measuring, etc...but now I understand it all. Never assume your scale is right!!!!