. Perfect compressor for the person who uses their airbrush all day long. Specially designed for the person who airbrushes for a living, an artist or an avid modeler, the AC 500 delivers non-stop performance. The AC 500 has an automatic pressure on/off switch, which allows the unit to maintain an even constant pressure, thus eliminating irritating pulsing will spraying fine lines or small details. If you have been looking for a compressor that is both quiet and reliable, than the new AC 500 is the compressor for you.