donbrew
In a later thread you answered my question
Ron

 

When I get new tires or rotate them, I got to my friendly Chevy dealer service department. They walk around the car with a thingy and send me on my way in about two minutes, no write-up or anything. I should bring doughnuts next time.

Without endorsement, there are knockoff tools on EBay for less than $10.00 shipped.