Differential pressure - gauge available from Dwyer is a device that can be made use for monitoring pressure of compatible gases and also air just as the previous version of the device did. All the models of this device are calibrated in the factory for specific ranges. The LCD available, that contains 4 digits can indicate the readings in metric units and also in common English and so there is no need for conversions. The four - button operation available with the device is simplified so that the set - up time can be reduced. It can also help in simplifying calibration by using span and digital push - button zero.