In the past I have used a old freezer compressor to pull vacuum but feel I need to get something different. I have been told to just get one from Harbor Freight for the kind of use mine will see. They have two different ones. One is a 2.5 cfm and draws down to 75 microns. The other is 3 cfm two stage and draws down to 22.5 microns. Which one should I get? The price difference isn't enough to be a big concern for me. So is the lower the micron number more vacuum pulled on the system? |