The Differential Pressure Gauge (0-1 inches of water) is an essential tool for measuring low air or non-corrosive gas pressures, both positive and negative (vacuum), as well as differential pressure in a variety of industrial, HVAC, and laboratory applications. Perfect for measuring fan and blower pressures, filter resistance, air velocity, furnace draft, pressure drop across orifice plates, liquid levels with bubbler systems, and pressures in fluid systems, this gauge provides accurate and reliable readings. Constructed from durable aluminum, this gauge is designed for long-lasting use and boasts a pressure rating of 15 PSI and an accuracy of ±2% of full scale at 70°F. It features 1/8” female NPT high and low-pressure taps for easy connection and quick installation, making it an ideal choice for systems using air or compatible gases. The temperature range of 20°F to 140°F ensures reliable performance across a wide range of environmental conditions. This differential pressure gauge is indispensable for applications such as filter monitoring, fan performance measurement, HVAC system diagnostics, and liquid pressure measurements in systems like fluid amplifiers or industrial machinery. Please note: this gauge is not for use with hydrogen gas.