We used the spring scale for4-5 years- the only thing with that is that our spring scale if not handled right you could get incorrect readings, it would make weight bigger than it should be if certain thing happened , if that calf jumps (ESPECIALLY SOME OF THE BIGGER ONES ) IT WOULD add ten ilbs really easy , we put 5- inch grips on our scal so that every thing was a one piece unit, but you had to press it right in front of your body, an if you lifted it correctly an paid attention it would work , but I had other people doing it an was checking some of them an I couldn't afford the margin of error that was possible with using the spring scale . An I reweighed some of the calves that I did an even came up with different weights , an did it right in one time period , one right after the other ...... Also with spring scale the way we did it , we then had to wrestle calf down an finish working them, now part of this is I'm over sixty an don't move like I use to , when I was younger this didn't seem as big a deal, but after using the digital scale their was no comparison in the accurracey , the digital gets the weight an locks in on that number , the calf don't fight once in the carrier an it really don't matter on the digital cause one it gets the weight no movement bothers it. The other way I just was never really comfortable about the weights, an I don't think it UNDER weighed any , but I'm not sure how many it over weighed ....an selling bulls to customers that use that individual weight to buy my bulls an don't pay much attention to the EPD'S IT IS REAL IMPORTANT ........... Also I CHECK the scales once a week with a 50 lb. sack of salt , also did the same thing with the spring scales ....