I agree, it could use more of the easy details, however, I don't have much issue with 10^-2 Pa, since standard atmospheric pressure is 101,325 Pa, so 0.1 Pa (10^-2 Pa, or 1.45x10^-6 psi) is definitely understood as a vacuum, but you're correct, why not just add "vacuum" for thoroughness.
I know mercury gauges use to have a 0 to 30 scale sometimes (not 0 to -30), and that was confusing!
I know mercury gauges use to have a 0 to 30 scale sometimes (not 0 to -30), and that was confusing!