Vacuum pump!

I am looking at getting a Edwards 12 two stage pump anybody used them? Would it be good for infusion? like this one

http://www.pchemlabs.com/product.asp?pid=1033

Ive not used that one but i have two edwards pumps in my shop. One is very large and plumbed into a tank. The other is a edwards speedyvac2. Both are fantastic and havnt had a single problem with them or anyother edwards pumps i have ever used.

what HG do you pull with the small one?

That will pull about 28.5 Hg. The speedyvac2 is a nice little pump and good for moving around, its a pump that i use for traveling work like repairs at race teams workshops.