Grass Instruments 7D polygraph made in the USA. This is a very serious piece of equipment that's up to the job of analysing Trump tweets. With no less than 8 twitching pens recording on 16" wide paper all capable of responding from separate inputs. Wonderful array of stylish 1980s knobs & switches on the vertical control panel add to the detail. Can also be used for displaying any kind of electrical activity either from the human body or complex electronic monitoring.
Prop ID: 2013