Finally got around to checking the pressure in the car's tires. The first tire said "4.4 psi" which I think is "44 psi". The second tire shows "1.6 PSI". The bus must be FLAT! The next two tires showed "2.1 PSI" and "3.8 PSI". There are only 4 measurement settings, so nothing can go wrong - it's a waste of money!