HHP886U is a dual input differential manometer with a USB connection for real time data logging to a computer. It feature a dual pressure input (P1 and P2) and a dual display which can be set to simultaneously display P1 and P2 or P1 and the differential pressure (P1 - P2). Pressure is displayed in one of four user selectable units and a record function will store the MAX, MIN, MAX-MIN and AVG pressure for each channel for later viewing. Software allows the user to display the data in a graphical format or export the data to Excel or text files for further= manipulation.