I'd just like to chime in here and say that it's best to pick up your scale in person rather than have it shipped to you.
I've had two shipped to me that end up with some serious calibration issues. I think there were issues while shipping (anything from being kicked, stepped on, tossed, wet, super cold, super hot, etc.etc.) that caused the scales I got off of Amazon to show a steady decrease in weight the longer it was on. So, say you turn the thing on and it's zeroed out with nothing on the bench, so it's reading 0.00g, right? Well, just wait about 15sec and that bad boy is going to jump into the negatives, slowly at first but getting faster with time. The last one would bottom out around -6.45g with nothing ever sitting on the scale. Crazy thing is they were still accurate so long as I used the TARE function or did some quick math once I weighed. 500g calibration weights would register a 500g difference in the reading (it would just go from like -5.00g to 495g), and the same with nickels consistently weighing 5g with about ~.05g give or take.
On the other hand, I went to Best Buy and picked one up in person and have never had any issues with it.