Alignment shops used to use a bubble gauge mounted on the wheel to adjust camber and caster (spindle angle and wheel attitude). One bubble gauge indicated camber while the other showed caster. Technology has done away with the bubble gauge and brought us laser-guided, four-wheel alignment at most shops across the country. Marlo's Frame & Alignment in Chatsworth, California, still gets outstanding results with the old-fashioned bubble method. The best front-end alignment tool is still a seasoned professional.