Which tool is most appropriate for checking the toe angle of wheels?

A toe gauge is specifically designed for measuring the toe angle of wheels, making it the most appropriate tool for this task. It allows a technician to determine the difference in distance between the front and rear edges of the tires, which is essential for adjusting the toe to ensure proper wheel alignment. This measurement is crucial for vehicle handling and tire wear.

While other tools like an alignment rack or laser alignment tool are also used for comprehensive wheel alignment checks, they are often more complex and involve multiple measurements, including camber and caster, in addition to toe. A camber gauge is specifically for checking camber angles and would not provide the necessary information on toe angles. Therefore, the toe gauge stands out as the most targeted and straightforward tool for checking toe angles alone.