An electrically-powered electronic instrument designed to measure and establish the degree of positive or negative pressure (pneumatic or hydraulic) found in a medical device, piece of equipment, or system. It is connected to the device, equipment, or system with the unknown pressure via a hose or connector and the pressure is sensed by this device and converted into a digital pressure reading displayed in one of several units, e.g., mmHg, cmH2O, or pascal. It is typically used by a healthcare provider (i.e., clinical technician) in a clinical setting.