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Magnehelic® Differential Pressure Gages

Select the Magnehelic Gage for a versatile low differential pressure gage with a wide choice of 81 models and 27 options to choose from.

Using Dwyer’s simple, frictionless Magnehelic gage movement, it quickly indicates air or noncorrosive gas pressures–either positive, negative (vacuum) or differential.

The design resists shock, vibration, over-pressures and is weatherproof to IP67. Select the -HA High Accuracy Magnehelic Gage option for an accuracy within 1% of full scale, located below in the Product Configurator.

Also included with the –HA option at no extra cost are a mirrored scale overlay and a 6 point calibration certificate.

Note: May be used with Hydrogen. Order a Buna-N diaphragm. Pressures must be less than 35 psi.


  • Filter Monitoring
  • Air Velocity with Dwyer Pitot Tube
  • Blower Vacuum Monitoring
  • Fan Pressure Indication
  • Duct, Room or Building Pressures
  • Clean Room Positive Pressure Indication


Contact Steen Holm Madsen

Specialist in Differential, HVAC komponents, Magnehelic, Pressure, Products for ventilation

phone (+45) 21 36 71 70

Office Hours 08:00 – 16:00 (weekdays)

[email protected]

Contact me with any questions