Sonderen Hyson 200 Track-Truck with a static cone penetrometer.
https://www.youtube.com/watch?v=VTlGfOln1AE
Previously:
https://www.homemadetools.net/forum/...178#post126266
https://www.homemadetools.net/forum/...931#post102869
https://www.homemadetools.net/forum/...062#post149396