I have been using a Digiweigh 35 pound digital scale for most my UL gear and it has worked well. It will weigh within 0.1oz, but that is usually more like 0.2oz for general use. When comparing small items and choosing components, it is interesting to have finer results. I found a tiny pocket-sized scale that is just 3.3 x 3.3 x 0.8" and will weigh up to 10.58oz/300g and the advertised readability is 0.005oz/0.1g. It also reads in grains and pennyweight/dwt and runs on two AAA batteries. It is made by Equinox, model EX-300.
One caveat is the small platform. A wide item can hang up on the sides, so another small flat object can be used as a riser and the scale can be zeroed with that in place.
So now I can split hairs on whistles, mini-biners and razor blades :)
I found this in a thrift store, but there is a web site that shows this one and happens to have an enormous inventory of digital scales: http://www.okpocketscale.com/index.php?main_page=product_info&products_id=888. $11!
