Vintage Grass Instruments Lab Equipment: Polygraph 1DAG DC Amplifier & 7P1G Pre-

Grass Instruments Polygraph Integrator Model 7P10-F *Brand new

GRASS INSTRUMENTS ELECTRODE SELECTOR PANEL RACKMOUNT RARE USED

Orion pH Electrode/Triode Thermo Scientific

GRASS INSTRUMENTS ELECTRODE SELECTOR PANEL RACKMOUNT USED

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

Vintage Laboratory Polygraph Machine Grass Instruments DC Driver Amplifier 7DAF

GRASS Instruemtns Polygraph DC Driver Amplifier 7DAF for Vintage Lie Detector