ORIGINAL: IroquoisArcher
I have one that's marketed by Coffey. It's called US Bowhunting Pocket Grain Scale. Is about 6" X 4" and comes with 4 AAA batteries and measures grains, grams, ounces and pennyweight(?). Has an LCD display and costs $39.99. We've compared it to other powder scales and it's right on.
I have the same scale and love it, it is small enough that I can keep it in my archery tackle box easily and it is accurate. I have a couple more in the shop as well.