2. Micrometers. Problems (a) and (b) are U.S. customary, (c) and (d) are met- ric, and (e) and (f) are U.S. customary with a vernier scale. (a) 10 (b) 587 2 34 5 0 4. Meters. (a) 50 100 150 200 250 300 350 400 450 500 psi (b) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0