This is the most accurate wheel alignment machine available all over the world. It works on reflection theory. Four Infrared cameras mounted on the wall, act as sensors. There is no cable or sensors mounted on wheels.

In conventional wheel alignment, sensors are mounted on wheels and it has an inclinometer, which is a very sensitive part, but while handling (mounting /removing) there are chances of disturbing calibration of sensors, and you may not notice difference in calibration unless and until you face a problem like tyre wear, vehicle pulling etc.
Secondly, in conventional wheel alignment machine, to take wheel run out which is essential part of wheel alignment process we need to lift each wheel and rotate one rotation to get the mean value of that wheel, it is time consuming, that's why lots of people with usual wheel alignment machine either try to make some kind of shortcut or bypass this process, causing incorrect Wheel Alignment.

In case of V3D Wheel Alignment machine both these drawbacks are eliminated:
As there are no sensors mounted on wheels there is no question of calibration disturbance or mishandling. We have to mount just a reflection fiber plate.
Secondly for taking run out we dont need to lift the wheels, we have to just pull vehicle one feet back and push it again one feet to its original position, machine will automatically sense the run out of all the four wheels at a time within seconds.