Using the Dream Stick is simple. Setup your strings in conventional manner parallel to the side of the car. Adjust the three telescoping ends of the Dream Stick to your wheel size. Place the Dream Stick against the wheel with your string running cross the right and left stainless steel rulers on the Dream Stick and read the right and left measurements. Dream Stick! No more shaky hands affecting your readings. Dream Stick! No more back and forth taking multiple measurements. Dream Stick! No more searching for that lost ruler. Our customers say it's a "Dream" come true.