Used to measure fan and blower pressures, filter resistance, air velocity, furnace draft, pressure drop across orifice plates, liquid levels with bubbler systems and pressures in fluid amplifier or fluidic systems. It also checks gas-air ratio controls and automatic valves.

• Indicate low air or gas pressures - positive, negative, or differential
• Includes pipe to barb adapters and mounting hardware
• Connections: 1/8 FPT
• Ambient temperature range: 20°F to 140°F
• Rated total pressure: -20" Hg. to 15 psig
• Overpressure: relief plug opens at approximately 25 psig
• Accuracy: ±2% of full scale throughout range at 70°F
• Flush mount diameter: 4 9/16"