Unit is a EG & G synchro-het lock-in amplifier.

Manufactures description
Using a patented synchronous heterodyning process the Model 186A offers 0.03-30 s time constant range for fast signal response, 10 ppm/K output stability, 5Hz to 100 kHz operating range without band switching or card changing, 100 nV full scale sensitivity, automatic signal/ reference tracking, single-ended or differential input, 300,000X full scale dynamic reserve, calibrated zero suppression up to =/- 1000% of full scale, 370* calibrated phase adjustment with 0.1* of repeatability.

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