The DMN series is a digital differential pressure indicator for heating, ventilation, and air conditioning applications. It is specially designed to be mounted into places that require the direct display of the measured pressure. This device is significantly useful in areas of instrument manufacturing and in places where the monitoring of air over pressure in needed. Such places include watched spaces that demand high safety and hygiene such as operating theaters. The DMN series functions as a measuring gauge for pressure differences. To measure the relative over pressure or under pressure, a single pressure input must be connected. This device operates only as a digital barometer.