Sealey Laser Wheel Alignment Gauge GA50Optical system uses low radiation laser beam to indicate toe in or toe out. Single leg configuration and reversible contact probes allow on ramp use. Works on most cars and light commercials with rim diameters from 200mm(8") to 600mm(23. 5"). Powered by 2 x AA batteries (not included) and includes operating instructions. Works on most cars and light commercials with rim diameters from 200mm(8") to 600mm(23. 5"). Specifications Detail Optical system