I've been doing my own alignments for 20 years just using an inclinometer that you can buy from any hardware store with a decent tool department. You can read the camber directly to within a eighth of a degree.
The caster reading is the difference in camber reading taken with the wheel at the steering stops. You just have to be careful determining the sign.
I always adjust to equal camber and caster on both sides. I measure total toe with a tape measure, but usually have to tweak the tie rods once or twice to get the steering wheel dead-on straight.