The Tool Aid In-Line Brake Pad Gauge, No. 65300, provides an easy and compact way of taking brake pad readings during service. The in-line style allows the gauge to be used on many vehicles without removing the wheels, the straight probe makes it possible to take and maintain readings, even when vision is obscured, and it works on internal and external pads. The red, yellow, green metric gauge allows for quick go-no-go readings on the fly and is calibrated against a 6mm backing plate.