We passionately protect the health of the world’s workforce.
OHD leads the industry as the only global provider of both OSHA- and ISO-recognized quantitative respirator fit testing technologies. With QuantiFit2 and AeroFit, we deliver not only precise results but also an intuitive, seamless user experience that redefines fit testing standards. Beyond fit testing, we provide a comprehensive suite of occupational health and safety products—including air sampling, noise monitoring, and advanced instrumentation—to empower safer workplaces.
Experience the Revolutionary QuantiFit2
The OHD QuantiFit2 is a highly specialized instrument that utilizes OHD’s scientifically proven and patented Controlled Negative Pressure (CNP) technology to directly measure respirator leakage. This innovative technology performs the fastest, easiest, and most precise elastomeric respirator fit test available, ensuring the best fit and protection for you and your employees.
Introducing the Brand New AeroFit
The OHD AeroFit is a versatile fit testing solution that harnesses advanced Condensation Nuclei Counting (CNC) technology to deliver precise and reliable results for all respirators, including N95 and elastomeric masks. Designed for ease and speed, AeroFit provides rapid OSHA-compliant fit tests with a user-friendly interface and cordless portability, ensuring accurate fit and protection.
Explore Some of Our Additional Brands
From respiratory protection to hearing conservation and more, we have you covered. We serve the occupational health market as a worldwide leader in fit testing, noise monitoring, and air sampling instruments.
SVANTEK
With 30 years of industry experience, SVANTEK has established itself as one of the leading innovators in sound & vibration products, producing some of the most accurate and reliable instruments available.
Gilian
The Gilian brand name is known for personal and area air sampling pumps, calibrators, and equipment that are tough, dependable, and perform to the highest standards required by industry professionals.
Industry-Leading Support
OHD is committed to delivering fast, reliable support with industry-leading response times, ensuring quick resolutions. Our expert team is focused on immediate, effective assistance to keep your operations running smoothly.
Fast, Accurate Calibrations
OHD offers on-going service, support, and calibration on all equipment sold. This includes, but is not limited to, the QuantiFit2, our Gilian and Svantek products and annual calibration for the Cirrus doseBadges, and Sound Level Meters.
“I left a message, really not expecting a reply. In a few short minutes, my call was returned by Stephen, who meticulously guided me through the process and fixed my problem. Stephen explained everything in a way I could actually understand. More companies should have Tech Support like this.”
Mark Middleton
Wesco
“The OHD QuantiFit provides us with confidence that our masks fit properly and will help to protect Philadelphia Police officers in the line of duty. We are able to efficiently and quickly fit test our personnel, with the most accurate fit test available. This has made the QuantiFit a great addition to our respiratory protection program.”
Matthew Fleming
Philadelphia Counter Terrorism Operations
“All, I wanted to say how impressed I am…I have used your competitor’s product before and in comparison your system is so simple. I also was impressed that I could not get it to pass a fit test with my beard on, whereas I could do that with other quantitative fit testers. Excellent job.”
Bruce Donato
CSP, CHMM, CECD (K&A First Aid and Safety, Inc.)
“My staff had some reservations about changing (from a TSI PortaCount) to the QuantiFit because it was a new technology and a new way of testing to them, but they quickly found the speed and ease of testing with the QuantiFit to be a real benefit.”
Ryan LeForce
Central Tech Industrial Coordinator
“We are extremely impressed with the machines. They have cut our fit test time considerably! Very pleased!”
Leslie Motheral
Firefighter Instructor
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