Linear Instruments Model 4101 chart recorder that prints on paper. Two
adjustments (input sensitivity 0.1 or 1 volt full scale, and paper
speed). There's even an extra box of paper. The whole unit is a 5"
cube, and there's a plastic front door that drops down to reload paper
or re-ink. The graph paper is about 3.5" wide. The paper has sprocket
holes on both sides and comes out the front, so you could wear a lab
coat and study the strip of paper just like in the movies.
I was never able to resolve the ink supply problem, but the ink tray is
there and the stylus. And when you turn it on, the paper advances V E R
Y slowly (I figure about 1/2" per minute).
Therefore sold-as is, no return. $47 shipped in lower 48. Paypal
please. Photos available.