Been using one of these critters for over a decade now for setting the elevation angle on satellite dishes, both big and small!
Since the internal pivot bearing tends to gum up a bit after a few of years, I buy a brand new one if I’m going to calibrate a dish position controller by it’s readings.
Track leveler? That’s a new one, but I’m not surprised in the least. These things are REALLY handy for a lot of jobs.
In a few weeks I expect to be pulling out one to check / adjust the sidecar attachments on my motorcycle.
BTW… why would you need a plate to rotate it 90 degrees? There are attachment magnets on TWO fases of the gizmo’s body, precisely 90 degrees apart!
Mr. T.