Dwyer Instruments

About Dwyer Instruments

Dwyer Instruments has been a cornerstone of industrial measurement and control since its founding in 1931. Headquartered in Michigan City, Indiana, the company has grown into a globally recognized leader in designing and manufacturing instrumentation solutions for the HVAC and process automation markets. With over 85 years of continuous innovation and more than 650 technical patents, Dwyer has earned a reputation for building sensors, gauges, and controls that professionals can depend on in critical, real-world applications.

A Legacy of Innovation

What sets Dwyer apart is its deep commitment to engineering excellence. The company invests in advanced research and development facilities and uses sophisticated computer modeling software to simulate real-world conditions — a process that results in measurement tools with superior accuracy and durability. Whether the application is monitoring airflow in a clean room, managing pressure in an industrial process line, or verifying safety conditions in an HVAC system, Dwyer instruments are engineered to deliver consistent, reliable readings.

Dwyer manufactures its products in the United States, with production facilities spread across the Midwest. This domestic manufacturing focus not only supports quality control but also ensures faster availability of products across a wide range of applications. The brand serves industries spanning HVAC, chemical processing, food production, oil and gas, and pollution control — a testament to the versatility of its product lineup.

Top Product Categories

Dwyer's extensive catalog covers a broad spectrum of measurement and control needs. Among their most well-known product lines are Spray Booth Manometers, which are widely used in automotive finishing environments to ensure proper air pressure differential — a critical safety and quality consideration in any professional paint booth. Their inclined and inclined-vertical manometer designs make it easy to get accurate low-pressure readings at a glance.

For building system professionals, Dwyer's HVAC Pressure Switches provide reliable on/off control based on pressure thresholds, protecting equipment and maintaining system efficiency. Complementing these are Dwyer's HVAC Sensors & Probes, which deliver the precise environmental readings that modern building automation systems depend on — from duct static pressure to air velocity and beyond.

Dwyer also offers robust Temperature & Pressure Controls for a wide range of industrial and commercial applications, as well as Boiler Safety Controls & Aquastats that help keep hydronic heating systems operating safely within defined parameters.

Why Choose Dwyer Instruments?

• Founded in 1931 — nearly a century of measurement expertise
• 650+ technical patents — a proven culture of innovation
• U.S.-manufactured — domestic production for consistent quality
• Broad industry reach — trusted in HVAC, process automation, oil & gas, food production, and more
• Iconic product lines — including the legendary Magnehelic® differential pressure gauges and Photohelic® pressure switch/gauges

Whether you're a technician troubleshooting an HVAC system, a shop owner maintaining a professional spray booth, or an engineer specifying instrumentation for an industrial process, Dwyer Instruments offers the precision tools to get the job done right.