I have been using it daily for 7 months to inflate tires on a 72-ton Cat dumper construction machine!! We are talking about 120 psi!! Excellent measurements! The only thing I can comment on, which is not very important, is the following: if you release the air supply at the gun's intake as it is connected, it leaks slightly... meaning it doesn't seal the return 100%, but we are talking about 120 psi... at lower pressures it was fine... EXCELLENT for its price