Once I figured these out, I've been very pleased with the results.
Good driving and no bad tire wear.
On a concrete floor one thing I had to do was use a piece of machined metal to be sure and set the camber reading to zero on a unlevel floor.
I set the metal on the floor for a smooth surface and the gauge on the metal.
Not directly on concrete.
The concrete surface was too irregular alone for the gauge contact points on the bottom to work well..
