When I first got out of the Navy in the early 80's one of the jobs I had was at a gas station... The whole side wall at one end of the shop was glass... They had just installed a brand new Hunter Light Align system... They were proud of their new equipment so they had it installed by the windows.... Only problem is it's a "Light" align system & wouldn't read right if there was to much light.... The old guy who was hired for doing alignments hated that machine... Brought in his personal set of magnetic snap gauges...