I have just decided to buy a Miller Air Pak for the industrial construction,Farm and Ranch,field service,oil field work,and mobile and diesel mechanic work that I do and it has just enough power I needed and it has a compressor.I believe a Ingersoll Rand but I don't know if that compressor is worth a darn to run heavy air tools and still weld and run lights on because I think it just has a 100psi.but I need the power of the welder but I dont know about the compressor unless I should also buy an engine driven air compressor with more psi but there is going to be another person with me running air tools while I weld but maybe somebody should tell me about the welder/compressor before I get ready to buy it.Thanks