The first of the two machines test the first side wall and half the tread. The second machine then checks the second side wall and completes the measurement of the tread. At the same time, the next tire is already being tested in the first machine. This enables the user to achieve a faster measuring cycle than with a single machine.
The twin machine is equipped with three measuring heads. Two of three measuring heads can be swiveled so that the side wall can be checked from the outside at the same time as the third measuring head measures the running surface. This means that even small tires up to a rim diameter of 8″ can be tested.