I have wanted a rotary compression tester for ten years.
Without realizing I had one sitting in my hanger
disguised as a Heath Kit strip chart recorder.
The paper runs at selected constant speeds while the
pen responds to 10 volts peak to peak. All I need now is a
30 dollar Free Scale pressure sensor like the one
Tracy uses in his EFI computer. Puts out 0 to 5 volts
from 0 to 30 psi. The paper drive motor is not
working but it looks simple to fix with all that
30 year old tech. The pen servo works great.
I found it when I was looking for the Aussi
CD system.

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Here is a used one for $150 bucks.

http://www.techbrokers.com/Techbrokers_Catalog_1Page36.html

And one for $225.

http://www.pemed.com/lab/labelectronics/labelectronics.htm

Here is a company that does the same thing with your computer
for as low as $25. RS232 so you need a RS232 to USB converter
for x amount more.

http://www.dataq.com/c_cr/?source=googlecr&gclid=CLDVjcPwy5kCFUFM5Qodrmm_uQ


Paul Lamar