The CEMB Digital Wheel Balancer ER72TD is made especially for busy tire shops. This new series has the latest technology in wheel balancing, “Spotter” lasers that actually pinpoints the exact location of stick-on wheel weights. This is done with little or no chance of operator error when entering dimensions (major cause of check spin errors). Full Time Static on screen for a perfect balance. The automatic arm measures diameters up to 30″, automatic entry of the dimensions with width sonar 3D. It comes fully assembled.Professional digital wheel balancer especially designed for tire dealers. Automatic Distance & Diameter Entry with Width Sonar (3D) Fully automatic Spotter Laser System for best correction possible Full-time accuracy with Static unbalance always displayed on screen LED to light the work space inside the rim New automatic arm to measure automatically diameters up to 30″ Standard locking with Quick Nut Electromagnetic brake for easy weight placement Available 110VAC or 220VAC Wide working space Direct selection ounces/grams Optimization program for compensation of rim and tire unbalance One Button Split & Hidden Weight Program