Trust me, use a metric ruler. Alignments are confusing enough without having to calculate fractions. Millimeters are far easier to deal in than 16ths of an inch.
If you're doing your own alignment, the strings/lasers are only good for setting toe. You can measure camber with a level and a protractor. You can't measure caster without special tools.
If you're doing your own alignment, the strings/lasers are only good for setting toe. You can measure camber with a level and a protractor. You can't measure caster without special tools.