To save some trips to the post office I decided to get a 5LB scale to start out as I'll mainly be shipping very light items. I took a look at the USPS price sheet to get an idea and thinking about it, this doesn't seem as useful anymore as if something does in fact weigh close to 5lbs, probably better off putting it in a priority box. However, I do have some smaller items that only weigh a few oz. My issue comes down to accuracy as I notice that if it's off by an oz, there's sometimes a price difference. Are the scales at the actual post office a lot more accurate or could they be off by a bit like these cheap scales? I'm not using an official USPS scale, just one of those WeightMax ones that I got for less than $20 which I thought was worth a shot. My concern is that my scale will say 10oz and in fact, it's maybe really 11 or 12 oz.. Anyone have any experience with this dilemma? As in the past apparently the post office messed up and undercharged me as I've had at least one incident where the person told me they had to pay a few cents to get their postage to the mailman which I found strange as they weighed it, not me... Fortunately it wasn't for a commercial transaction which would of looked bad on my part.