I've tried 2 different models..I didn't like either of them..I use this one..cost 9.98 at Walmart..I've calibrated it many times[ Meaning checked it out with accurate solid weights] ..it's right on..
Here's how I calibrate it...little sneaky..but here goes..
A, Carefully take scale out of package.
OR pay for it first ..but stay in the store..
B. Go to the produce section and get a couple of plastic bags..
C. Go to the lifting weight section of the store.
put different sized weights in the plastic bag and weigh..
EXAMPLE...1 pound weight... 2pound..5 pound ..10 pound..
IF your not happy with the results..Go to customer service and return your scale..We used to sell ALOT of stuff on Ebay and have a post office scale..This Rapala mechanical is right to the ounce..I've had the Berkley and Rapala digital and I was not happy with mine..I tried 3 different Berleys out in the store and all 3 were way off...some more then 2 pounds..The Rapala flat out would only work 50 % of the time..It wouldn't come on..