The Accu-turn 1550 wheel balancer has fully automatic parameter entry, all 3 parameters are entered automatically when the hood is lowered. User-friendly raised display for durability and easy viewing. 220V power supply provides HD power feed. Multiple operator capability, allows 2 operators to work the wheel balancer at the same time, without loss of wheel parameters. Multiple balancing modes including PAX balance mode, tire matching , and hidden spoke mode. Hidden Spoke program calculates weight amount so that weights can be applied behind the wheel spokes for the most aesthetically pleasing tire and wheel balance job. Truck round-off mode to ensure proper balancing of light truck and SUV tires and wheels. Automatic tire matching suggestion when high static imbalance values are detected. Stop-on-top feature eliminates the need to rotate the tire to find the correction plane. Two brake systems featuring automatic brake after measuring run as well as foot activated spindle lock to guarantee accurate weight placement. 6 second balance cycle time. 22 molded weight storage bins with on-balancer cone storage.