This is a Roehrig 2 horsepower model which I chose for all the options that come standard and the good $/€ exchange rate
The motor turns a big bearing inside a scotch yoke mechanism to create a real sine movement.
Here's a pic with her clothes off
You can see the two pick ups for speed and displacement either side of the scotch yoke 
And with the bearing removed where you can see the two different stroke fixings, 1" and 2"
And the bearing. Which is not small. That's a 1" AF bolt head...
Here's my home made lower shock fixing which is attached directly to the scotch yoke mechanism
And the top fixing attached to the strain gauge
With a shock in place
And the infra red temperature pick up
And the whole lot hooked up to a laptop ready to run
The Roehrig software enables you to create preconfigured tests using all sorts of different parameters. The "protech standard 14" is my final check for any ProTechs I sell over here. It automatically warms the shock to 30°C and then takes you through the test with on screen prompts at each adjustment change
Here's the prompt screen. There's no message at the moment cos I'm too lazy
Once the test is run the data gets saved to the hard drive and you can then display it as you wish. Here's a standard force/displacement (potato) graph
And a force/velocity graph
You can print out the graphs to send out with the shocks. Here's one for a Caterham SV damper
As with most software there are heaps of options which I'm in the process of exploring right now. The preconfigured tests are fun too. You can do almost anything you want to including running heat tests taking data at various temperatures to measure fade. It will also measure gas pressure for high pressure units and seal friction too.
Hope you find this interesting.
Mike
