Mine is a pocket scale I got from ebay that is good up to 2000g. Just search for '2000g pocket scale' on eBay and there is lots. This is exactly like mine:
I know mine is accurate because a lot of my gear I had weighed previously at work on an expensive scale and with this scale everything weighed within a gram of those weights.
To use this small scale with large stuff I either hang a hanger on the scale, zero it and then hang the item on the hanger OR I set something on the scale that is tall and wide (ie. a Nalgene bottle), zero the scale, and then set the item on the bottle.