Eg&g PAR Model 124a lock-in amplifier NASA surplus test equipment with case

Description

This is an EG&G/Par model 124a lock in amplifier with model 116 preamp. Unit appears to be in very good condition and functioning properly. Its previous history is NASA surplus and came out of the Lewis Research Center before coming into my possession according to the sticker on it.
I cannot test it in terms of calibration but it appears in excellent condition and functions working as expected. I had used this for experimental audio purposes briefly and it performs like nothing else for that if you are interested in test equipment music. The PSD dial is pretty stiff, probably just needs some contact cleaner. All other switches and knobs operate smoothly.
Cosmetically there are a few scratches on the top and side of the case but the front looks perfect with zero fading. I have not seen a better condition specimen of this unit. It is sold as-is as I cannot test it in terms of calibration or how it was intended to be used.
It comes with optional rack ears and a 3u gator rack mount case which it will ship in and fits the whole unit perfectly.