Protect your iSUP investment with this handy pressure gauge. Maintaining proper air pressure in your iSUP is very important. If the air pressure inside your iSUP is too low, it negatively affects performance. If the pressure is too high, whether from over-pumping or the heat of the sun, you could burst the seams. Accurately measures air pressures from 7 to 25 psi (.5 to 1.8 bar).