GRASS Instruments Polygraph D.C. Driver Amplifier & Pre-Amplifier 7P1D Vintage Scientific Equipment

This listing is for a vintage GRASS Instruments Polygraph D.C. Driver Amplifier and a Low-Level D.C. Pre-Amplifier, Model 7P1D. This is a classic piece of scientific and laboratory test equipment, formerly used for physiological measurements, including in polygraph and lie detector systems.

Condition: The unit appears to be in good physical condition for its age, with signs of cosmetic wear consistent with use. Please refer to the photos for a detailed look at the cosmetic condition. The unit has not been powered on or tested and is being sold as-is for parts or restoration.

Features:

• Brand: GRASS Instruments

• Models: Polygraph D.C. Driver Amplifier & 7P1D Pre-Amplifier

• A unique and historical piece of scientific equipment.

• Ideal for collectors, enthusiasts of vintage electronics, or for use as a prop or display item.