Dwyer 2340 Magnehelic Differential Pressure Gauge 20"-0"-20"

Dwyer Magnehelic Gauge specifies positive, negative (vacuum) or differential low air or non-corrosive gas pressures. Known to be the standard gauge to measure fan and blower pressures, filter resistance, air velocity, furnace draft, the pressure drop across orifice plates, liquid levels with bubbler systems, and pressures in fluid amplifier or fluidic systems. Can also be utilized in the medical field on which it checks gas-air ratio controls and automatic valves, and monitors blood and respiratory pressures in medical equipment. 

The cost-effective design is shock resistant, vibration, and over-pressures. No manometer fluid to evaporate, freeze or cause toxic or leveling problems.

Note: May be used with Hydrogen. When ordering a Buna-N diaphragm pressures must be less than 35 psi.