The APT Series is a quality built microprocessor based system for measuring both positive and negative differential pressure. The Apreco APT senses the pressure of air and compatible gases and has the ability to send a standard 4-20 mA output signal. The housing is specifically designed to enable the gauge to be removed for annual servicing and calibration. A wide range of models are available factory calibrated to specific ranges. Pressure connections are inherent to the glass filled plastic moulded housing making installation quick and easy. Digital push-button zero and span simplify calibration over typical turn-potentiometers. 90mm digit LCD shows the pressure differential readings in pascals.