OHD

What OHD does

OHD (Occupational Health Dynamics) is a US-based private manufacturer, founded in 1992 and headquartered in Hoover/Birmingham, Alabama, specializing in quantitative respirator fit testing instruments and complementary occupational health and safety monitoring equipment. Its core proprietary products are the QuantiFit2™, which uses patented Controlled Negative Pressure (CNP) technology to directly measure respirator leakage for elastomeric respirators, and the AeroFit®, which applies Condensation Nuclei Counting (CNC) technology to test N95 and elastomeric respirators. Beyond these proprietary platforms, OHD distributes and supports SVANTEK (sound and vibration), Gilian (air sampling pumps and calibrators), Benson, and ION Science product lines, creating a broader occupational health portfolio spanning respiratory protection, hearing conservation, and air quality monitoring.

The company's revenue model combines hardware sales of precision scientific instruments with smaller recurring streams from Logic Cloud compliance software, OHD Academy training services, and ongoing calibration and service contracts. Go-to-market is executed through direct enterprise field sales (with demo, quote, and self-service "Find Your Fit" engagement paths), an owned e-commerce storefront, and an international distributor network reaching fire departments, law enforcement, military, hospitals, mining operations, occupational health clinics, industrial hygienists, and health & safety managers globally. Pricing is quote-based with multi-year contract cadence and is not publicly disclosed, reflecting a specialized B2B sales motion targeting organizations subject to OSHA and ISO respiratory protection compliance requirements.

Operationally, OHD holds proprietary patented CNP technology and trademarked product brands (QuantiFit2™, AeroFit®), and positions itself as the only global provider of both OSHA- and ISO-recognized quantitative fit testing technologies. The company is structured as a limited liability limited partnership (OHD, LLLP), is independently owned with no disclosed external parent or institutional investment, and operates with a small employee base of 11-50 despite its multi-decade history and global reach.

Name

OHD

Legal name

OHD, LLLP

Website

https://ohdusa.com

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

11–50 employees

Short description

OHD is a US-based manufacturer of quantitative respirator fit testing instruments, offering patented CNP-based QuantiFit2™ and CNC-based AeroFit® devices alongside distributed occupational health monitoring brands. It serves fire, law enforcement, military, healthcare, mining, and industrial safety customers globally.

Ownership category

akta.pro rank

Product category

Occupational Health and Safety Instrumentation

NAICS

Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451), Other Measuring and Controlling Device Manufacturing (334519), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (3345)

SIC

Industrial Instruments For Measurement, Display, And Control (3823), Measuring & Controlling Devices, Nec (3829), Services-Testing Laboratories (8734)

akta.pro primary industry

Test & Measurement Equipment (Oscilloscopes, DAQ, signal analyzers, calibration benches) (IMAGAFAC)

akta.pro secondary industries

Industrial Hygiene & Exposure Control (Noise, Dust, Respiratory) (EDABAEAC), Occupational Health & Industrial Hygiene (BPAHAJAD), Test, Measurement & Calibration Equipment Manufacturing Services (ATE, DAQ, metrology electronics) (IMAGAGAH)

Keywords

• Respirator fit testing
• Occupational health instruments
• Air sampling pumps
• Noise monitoring equipment
• Fit testing compliance

Headquarters

HQ city

Hoover

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Hardware Sales - Respirator Fit Testing Instruments: OHD generates primary revenue through the sale of specialized occupational health instruments including the QuantiFit2 and AeroFit fit testing devices. These are precision scientific instruments sold to organizations requiring respiratory protection compliance.
2. Occupational Health Monitoring Equipment: Sale of complementary products including air sampling pumps (Gilian brand), noise monitoring instruments (SVANTEK), sound level meters, and calibrators. OHD distributes and supports multiple branded product lines.
3. Calibration and Service: Ongoing service, support, and calibration on all equipment sold, including annual calibration for Cirrus doseBadges and Sound Level Meters. Offered through service packages.
4. Training and Software: OHD Academy provides training services and Logic Cloud Software provides compliance management solutions.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels8 records

Core offering

OHD designs, manufactures, and distributes occupational health and safety instrumentation, with a core focus on quantitative respirator fit testing devices (QuantiFit2™ using Controlled Negative Pressure technology and AeroFit® using Condensation Nuclei Counting technology). The company complements its proprietary instruments with distributed brands in noise monitoring (SVANTEK), air sampling (Gilian), and other occupational health product lines, plus Logic Cloud compliance software, calibration services, and the OHD Academy training program.

Product overview

OHD offers a diversified portfolio of occupational health and safety products centered on respirator fit testing technology. The core offerings include QuantiFit2™ (using Controlled Negative Pressure/CNP technology) and AeroFit® (using Condensation Nuclei Counting/CNC technology), both OSHA- and ISO-recognized quantitative fit testing systems. Beyond proprietary fit testing instruments, OHD distributes complementary brands including SVANTEK (sound and vibration monitoring), Gilian (air sampling pumps and calibrators), Benson, and ION Science products. The product suite is complemented by Logic Cloud Software for compliance management and OHD Academy for training services, creating an ecosystem addressing respiratory protection, hearing conservation, and air quality monitoring for industrial, first responder, and healthcare sectors.

Differentiator

Problem solved

Functional benefit

Brands

• QuantiFit2™: Quantitative respirator fit testing instrument utilizing Controlled Negative Pressure (CNP) technology for measuring respirator leakage.
• AeroFit®
• SVANTEK
• Gilian
• Benson
• ION Science
• Logic Cloud

Products and services

• QuantiFit2™

Quantifiable outcome

• Significantly reduced fit test time compared to previous methods
• +1 more outcomes

Named customers5 records

Segments8 records

Ideal customer profiles6 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Six partnerships are on record, tiered core and minor.

• SVANTEKcoreChannel Partner/ Reseller/ DistributorOHD distributes SVANTEK products including sound and vibration instruments. SVANTEK has 30 years of industry experience as a leading innovator in sound and vibration measurement products. OHD provides calibration services for SVANTEK products.
• GiliancoreChannel Partner/ Reseller/ DistributorOHD distributes Gilian brand products including personal and area air sampling pumps, calibrators, and equipment known for being tough, dependable, and meeting high industry standards. OHD provides calibration services for Gilian products.
• BensonminorChannel Partner/ Reseller/ DistributorOHD distributes Benson brand products as part of their comprehensive occupational health and safety product portfolio.
• ION ScienceminorChannel Partner/ Reseller/ DistributorOHD distributes ION Science products as part of their occupational health and safety product offerings.
• Cirrus (doseBadge)minorChannel Partner/ Reseller/ DistributorOHD provides annual calibration services for Cirrus doseBadges as part of their calibration service offerings.
• TSI (PortaCount)minorOthersCompetitor relationship referenced in customer testimonials where organizations switched from TSI PortaCount to OHD QuantiFit2, noting faster testing and greater accuracy.

Scale indicators1 record

Recent moves6 records

Expansion highlights6 records

Others

• TSI (already listed above): Reserved placeholder—excluded to avoid duplicate entry.

Direct peers

• TSI: TSI's PortaCount line is the dominant quantitative respirator fit tester and is explicitly named in OHD's own customer testimonials as the incumbent OHD displaces. Both companies serve industrial hygienists, occupational health clinics, and respiratory protection programs with comparable quantitative fit testing instruments.
• SKC Inc. SKC manufactures air sampling pumps, calibrators, and fit testing accessories used by industrial hygienists—the same primary buyer persona OHD targets. SKC competes in OHD's distributed air sampling category (Gilian) and adjacent fit testing workflows.
• Casella: Casella specializes in occupational hygiene instrumentation including noise monitoring and air sampling. Casella competes directly with OHD's SVANTEK and Gilian distributed lines in the industrial hygienist buyer persona.
• Sensidyne: Sensidyne is a US-based industrial hygiene instrumentation distributor and manufacturer covering air sampling, sound, and gas detection. Sensidyne directly competes with OHD's distributed product portfolio in the industrial hygienist channel.

Broad incumbents

• 3M: 3M is a global safety conglomerate that supplies N95 respirators and adjacent fit testing solutions. While 3M is the largest respirator manufacturer rather than a fit test instrument vendor, it is a relevant incumbent shaping customer fit testing programs and is frequently evaluated alongside OHD's fit testing devices.
• Honeywell: Honeywell's personal protective equipment division supplies respirators and broader workplace safety solutions. Honeywell overlaps with OHD's served segments (industrial hygienists, fire, military, mining) as a multi-line safety incumbent.
• MSA Safety: MSA Safety manufactures respiratory protection, hearing protection, and gas detection products used by fire departments, military, and industrial customers. MSA competes for the same occupational health budgets as OHD across overlapping fire and industrial verticals.
• Dräger: Dräger is a global safety and medical technology company with quantitative fit testing instruments, respiratory protection, and gas detection. Dräger directly overlaps with OHD's fit testing and occupational health monitoring portfolio across European and US markets.

Emerging players

• Moldex-Metric: Moldex manufactures respiratory and hearing protection products and is expanding into fit testing accessories. Moldex is an emerging player that intersects with OHD's fit testing adapter and respirator compatibility ecosystem.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/ohdglobal
• YouTubeyoutube.com/channel/UCxWhnDT3OeP_bICHM4uxjtg
• Facebookfacebook.com/OHDGLOBAL
• LinkedInlinkedin.com/company/ohd-inc

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about OHD