The Hivac XN12 numicator is a medium-sized nixie tube. It is typical of Hivac tubes in that it has a gold-colored anode. No one seems to know why they have this color, but to me it looks like a chromate conversion coating.
| Digit size | 15.5mm |
| Min current(guess) | 1.5mA |
| Max current (guess) | 3.0mA |