I use this one.
http://www.midwayusa.com/viewProduct...tNumber=476992

What it doesn't show is the 3rd item needed which is a rod that is caliber specific as well as the case holder that comes with the rod. The rod is what measures the casing because it fits through the primer hole and hits the base for a consistent measurement. It makes a lot more sense when you have it in front of you. I like it, it works great. It is rough on the fingers if you are doing a lot of cases. I usually do about 20 -30 cases at a time. and then do the rest the next day. If you have a drill or cordless screwdriver that the holder fits into, that makes it quicker and easier.
Good luck!