Inaccurate air pressure of chambers or air floor can cause low performance of inflatable boat. Overpressure can be cause blow-out of your inflatable boat. To prevent these events from happening it is important to maintain proper air pressure. Bravo air pressure gauge designed to fit into Halkey-roberts(H-R) valve. 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.