1.Computer calcutale four wheel alignment data through 3D digital signals, target boards fixed on 4 wheels by 2 speedy&high-accuracy digital dynamic carmeras; 2.The four target boards only have detector imagin, w/o electronic parts and connection, reduce fault greatly; 3.Only lift one time, or push the car, eccentric compensation could be achieved, improve measuring speed very much; 4.No need calibration before use, because the machines were calibrated very well before delivery; 5.3D animation guides technicians how to adjust; 6.Steering wheel reset function ensures the steering wheel keep straight without adjusting set back or thrust angle; 7.Optional wheelbase and tread measurement fuction, technicians know the chassis condition much better; 8.Quick searching the four wheel alignment data, and upgrade database by free permanently.