really depends on what you want to weigh.
I have two.
A little one that weighs 0-500g
And a bigger kitchen one that weighs up to 11 lbs
99% of my weighing is on the little one. Weigh your big stuff once a the Post Office, and you seldom need that capability again.
The little scales can get messed up and need calibrating. You can order a 100g standard weight for this for ~8. The calibration is linear, so if your 100g wt weighs 102.5 g, its off by 2.5%. Some scales take 200 or 500 g calibration wt. All you need to do is calculate though off the 100g wt. If you need 500g, weigh out a cup of water that weighs 410 g (4x102.5)and use it in addition to your 100g wt, and then calibrate the scale. Recheck your 100g wt and it should be on the money.