So I saw some mention of this but no posts...
I have the calibration "eye" from a 1976 Stanford Research Institute Dual Purkinje Image eyetracker, mounted on a GS300PD galvo, and accompanying rack unit which I think contains the amp and sine/triangle/square wave generators. It's supposed to be good for about 300 Hz at 3 milliradian accuracy...?
On the back of the eye optic is a regular first surface mirror so you could use it as a beam director with no other changes.
Anyone want to make it worth bringing?