The Differential Pressure Gauge is engineered for precision in measuring low air or non-corrosive gas pressures in a variety of industrial and HVAC systems. With a measurement range of 0-0.5 inches of water, this gauge accurately monitors positive, negative (vacuum), or differential pressures for tasks such as measuring fan and blower pressures, filter resistance, air velocity, and more. Made of durable aluminum, the gauge is designed for air and compatible gases (excluding hydrogen gas) with an accuracy of ±2% of full scale at 70°F. It features 1/8 inch female NPT connections for both high and low-pressure taps and offers dual side and back connections for versatility. This gauge is perfect for applications like furnace draft, pressure drop across orifice plates, and liquid levels in bubbler systems. Ideal for industrial, HVAC, and fluid amplifier systems, this differential pressure gauge ensures dependable performance in demanding environments.