The Dwyer Magnehelic gauge is the industry standard to measure fan & blower pressures, filter resistance, air velocity, combustion chamber draft & more.
Pressure limits ‑20"Hg - 15 psi.
Temperature limits ‑7°C to 60°C.
4" diameter dial.
Mounting orientation: diaphragm in vertical position.
Connections: ⅛" female NPT, 1 pair at side & 1 at rear.