... for environmental interference, and good repetition; 3. All digital sensor, LED electronic gradienter structure, which keep step with numeral era ... 2 post ,4 post,scissor lift,etc)2)tire changer(car tire changer,truck tire changer,semi-automatic,full-automatic)3 ... )wheel balancer(car wheel balancer,truckwheel balancer,semi-automatic,full-automatic)4) ...