Peter and Kerstin offer an elegant solution to measure (and then correct) the runout of a disk brake rotor. The disk brake accessory is a lovely clamp to one truing stand leg, that holds a green anodized analog dial gauge.
Brake rotors can become bent in use and travel so this device will be a regular asset in your business. Now you can remedy bent rotors easily. When the gauge is not needed, it can be swung neatly out of the way.