BiggTony, thanks for the information. I looked up the G46 and G33. The G33 has the open handle which should make it easier to clean, versus the other with the closed handle.

The Iwata HP-CS has a fixed, rather large, 1/3 oz. cup, one .35mm needle and costs $40 more.

I'm thinking I might try to paint white outline numbers on the tank with the airbrush, even crosses etc. Would a .3mm needle work well for that, or is that a job for a .2mm? I've tried painting thin white lines with a fine paint brush and have found it hard to get a consistent line thickness by doing it that way.