Heavy-Duty Truck Brake Lining Gauge

This is a tool used to measure the brake lining on heavy-duty trucks. It's especially helpful for sticking through dust shields to measure the remaining lining while the wheels are still on the vehicle. I'm a mechanic and use this tool to complete inspections on trucks. I printed it in glow-in-the-dark filament to make it more visible when underneath vehicles. I use a regular key ring to hold them all together.