Caster camber gauge
And post 6 shows a good point. That is, depending on the rig, the wheels, other factors, not all caster/ camber gauges may fit. You may have to make or buy some sort of adapter.
I had bought a very old alignment machine cheap, early computerized. I was able to gut the wheel clamp on devices and remove the electronics from them. This left a clamp on device with a nice flat platform to mount what I need for caster / camber.