QMED Oiler Certification Practice Exam 2026 - Free Oiler Certification Practice Questions and Study Guide

The differential pressure gauge is specifically designed to measure the difference between two pressure readings. This instrument is crucial in various applications where monitoring the pressure difference is essential for system performance, such as in filtration systems, HVAC, and process control. By capturing the difference, this gauge provides valuable information about flow rates, filter conditions, and system inefficiencies.

In contrast, a digital gauge typically displays a single pressure reading in a digital format, and while it can be used to monitor pressure, it does not inherently provide a measurement of pressure difference. A compound gauge can measure both positive and negative pressures relative to atmospheric pressure but does not specifically focus on the difference between two independent pressure sources. Lastly, a vacuum gauge is specifically designed to measure pressures below atmospheric pressure and does not account for the measurement of pressure differences between two points. Thus, the differential pressure gauge stands out for its unique capability to provide the necessary readings for applications where pressure differential is a critical parameter.