Inaccurate air pressure of chambers or air floor can cause low performance of inflatable boat. Over-pressure can be cause blow-out of your inflatable boat. To prevent these events from happening it is important to maintain proper air pressure. This air pressure meter can be used on RIBs, soft bottom inflatables or river rafts. This air pressure gauge can provide readings of up to 14.7psi or 1 bar Please be informed that warm weather will increase the air pressure, cold weather will reduce the air pressure, it is important to recheck air pressure in the chambers when the temperature change.