The digital value of the measured pressure is displayed on a 4-figure main “LCD” display with the resolution 0.1% of the nominal range and in user selected units. A positive value corresponds with overpressure, a negative value with underpressure, with differential measuring a positive value corresponds with higher pressure on the positive pressure input. It is possible to extend the sensitivity 10 times for displaying the main pressure value. The auxiliary display can show data from the selected functions, Temperature, Min/max, Leakage test (e.g. 4Pa test), Speed/flow, and the Data logger. The display are displayed in the same units as the main pressure data. A help-line is situated in the bottom part of the display which informs about the functions of the multifunctional buttons “arrows”. The date, time and battery indicator are situated in the upper part of the display.