you looking at the pump up manual kind?
I had one for about 4 years, and when I got it out to do my brakes 2 weeks ago, it shit the bed. I think the plunger that creates the pressure, and is supposed to be an air tight seal, gave up, puking fluid out the top.
Jones has one, (i'm using it now) and its probably the same age, and it still works fine. THey are well worth the money.
I will be buying a replacement after I get this round of bleeding done. I can't speak highly enough about them.
I know Nickey427 has one rigged for air, but your compressor has to have a valve to adjust pressure I think.
Get one.