They should be fine for air. The psi is the inside graduation, so your gauges top out at 30, 60 and 100. The middle gauge also appears to have been shocked. The needle is way off from zero
Ah...i didnt know the inside was psi. They had some that i thought were 4000 psi but now I know to look at the inside measurement. Ill go pick up more of the higher pressure ones.