TSI Incorporated

What TSI Incorporated does

TSI Incorporated is a privately held U.S. precision measurement instrumentation manufacturer founded in 1961 and headquartered in Shoreview, Minnesota, with 501-1,000 employees and wholly-owned sales entities in France, Germany, and the United Kingdom. The company designs and builds sensor-based instruments for aerosol science, particle counting and sizing, airflow and ventilation measurement, indoor and outdoor air quality monitoring, cleanroom contamination control, respirator fit testing, noise dosimetry, and heat stress monitoring. Its core technology combines proprietary sensor designs, data acquisition electronics, and analytical software, organized around a hardware-plus-platform-plus-services architecture that increasingly ties installed instruments to the TSI Link cloud software environment. The product portfolio spans flagship brands such as PortaCount, DustTrak, OmniCount, BioTrak, VelociCalc, OmniTrak, and the acquired Quest, Casella, and MSP lines.

TSI generates revenue through three primary streams: (1) hardware sales of precision measurement instruments sold direct to enterprise accounts and through a global distributor network; (2) recurring software and SaaS subscriptions on the TSI Link platform, including TSI Link Smart Bridge for DustTrak monitors and TSI Link for Respiratory Protection; and (3) long-tail service, repair, and calibration revenue from a service organization with over 60 years of operation. The company sells into twelve vertical markets — HVAC and TAB consultants, occupational health and safety, indoor environments, electronics manufacturing, healthcare, life sciences, industrial manufacturing, emergency response and law enforcement, outdoor environments, power generation and mining, research and development, and Casella solutions — using a sales-led go-to-market model with direct enterprise field sales, inside sales support, and authorized distributors. Pricing is not publicly disclosed and is quote-driven through the sales team.

Name

TSI Incorporated

Legal name

TSI Incorporated

Website

https://tsi.com

Company type

Private

Founded year

1961

Operating status

Operating

Headcount range

501–1,000 employees

Short description

TSI Incorporated is a privately held U.S. precision measurement instrumentation manufacturer founded in 1961, serving twelve verticals including HVAC, occupational health, cleanroom, life sciences, and research with proprietary sensor-based instruments, the TSI Link SaaS platform, and a global direct-and-distributor sales network.

Ownership category

akta.pro rank

Product category

Precision Measurement Instruments

NAICS

Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables (334513), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451), Analytical Laboratory Instrument Manufacturing (334516)

SIC

Industrial Instruments For Measurement, Display, And Control (3823), Laboratory Analytical Instruments (3826), Services-Testing Laboratories (8734)

akta.pro primary industry

Calibration Services & Standards (Calibration labs, reference standards, traceability services) (IMAGAFAH)

akta.pro secondary industries

Indoor Air Quality (IAQ) Testing & Monitoring (HSAOAIAD), Testing, Inspection, Certification & Commissioning (TICx) Technical Services (BPAHAIAL)

Keywords

• Precision measurement instruments
• Aerosol and particle counters
• Air quality monitoring
• Ventilation testing equipment
• Respirator fit testing

Headquarters

HQ city

Minnesota City

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Precision Measurement Instruments: TSI generates the majority of its revenue from the sale of precision measurement instruments including particle counters, air quality monitors, flow meters, ventilation testers, respirator fit testers, and noise dosimeters. Products are sold directly and through channel partners globally.
2. Software and SaaS Subscriptions: TSI derives recurring revenue from software platforms including TSI Link for Respiratory Protection and TSI Link Smart Bridge. These cloud-based SaaS solutions provide remote monitoring, compliance management, and data analytics, typically sold on a subscription or license basis.
3. Service, Repair, and Calibration: TSI offers instrument service, repair, and calibration through its service organization, providing recurring revenue through service plans, calibration contracts, and on-demand repairs. TSI Service has been delivering instrument service for over 60 years.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

TSI Incorporated designs, manufactures, and services precision measurement instruments, software platforms, and calibration/repair services for laboratory and field applications. Its portfolio spans particle counters, aerosol and dust monitors, ventilation test instruments, indoor air quality meters, flow meters, respirator fit testers, noise dosimeters, and cleanroom particle counters, complemented by the TSI Link cloud software ecosystem and the OmniTrak wireless multi-parameter monitoring platform.

Product overview

TSI Incorporated offers a comprehensive portfolio of precision measurement instruments and software solutions organized as a platform-plus-modules architecture. The core offerings include particle counting and sizing instruments (OmniCount, particle counters, particle sizers), air quality monitoring systems (DustTrak, indoor air quality meters), ventilation testing equipment (VelociCalc, Airflow TA500, capture hoods), and occupational health instruments (PortaCount fit testers, noise dosimeters, heat stress monitors). The company operates through distinct divisions including its main instrumentation business and MSP Solutions focused on pharmaceutical testing. TSI Link serves as the central software platform enabling connectivity and data management across devices, while products like OmniTrak provide modular wireless solutions for multi-parameter air monitoring. Recent expansions include enhanced ventilation meters with VOC/CO2/humidity probes and new condensation particle counters.

Differentiator

Problem solved

Functional benefit

Brands

• TSI Link: Cloud-based IoT platform for device monitoring, data analysis, and respiratory protection program management
• OmniTrak
• OmniCount
• PortaCount
• DustTrak
• BioTrak
• Quest
• Casella

Products and services

• VelociCalc 9600 Series Multi-function ventilation meter for HVAC testing, cleanroom testing, and biological safety applications, supporting four duct traverse methodologies including ASHRAE 111 and EN standards.
• Airflow TA500 Multi-function ventilation meter for HVAC testing, cleanroom testing, and biological safety applications with expanded probe compatibility and duct traverse methodology support.
• TSI Link for Respiratory Protection

Quantifiable outcome

• TSI Link for Respiratory Protection won the 2026 Occupational Health & Safety Industrial Hygiene Award in the Respiratory Protection: Fit Testing category, demonstrating measurable industry recognition for compliance and efficiency outcomes.

Segments11 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• University of MinnesotaminorStrategic or Co-development PartnerTSI partners with the University of Minnesota for its internationally recognized Aerosol & Particle Measurement Short Course, offered annually. The course provides professional education in aerosol science and particle measurement, reflecting TSI's commitment to advancing aerosol education.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• Aeroqual: Specialized air quality monitoring company focused on real-time gas and particulate sensors for environmental and IAQ applications, overlapping TSI's DustTrak and IAQ meter categories with a more software-centric approach.

Direct peers

• SICK AG: Industrial sensor and measurement manufacturer with overlapping flow, gas, and particle measurement capabilities for HVAC, cleanroom, and industrial process monitoring.
• Sensirion: Manufacturer of high-precision gas flow, humidity, and particulate sensors used in HVAC, medical, and industrial applications — overlapping with TSI's flow meters, IAQ probes, and sensor modules.
• Dräger: German safety and measurement specialist with overlapping respiratory protection (fit testing), gas detection, and occupational health product lines serving industrial hygiene and emergency response markets.
• Particle Measuring Systems (Spectris): Direct competitor in cleanroom and pharmaceutical particle counters (Apex, Lasair III, BioTrak-class products) and a closely overlapping target customer base in semiconductor and life sciences manufacturing.
• Lighthouse Worldwide Solutions: Direct competitor in cleanroom particle counters and contamination monitoring for semiconductor and pharmaceutical customers, with overlapping ISO 14644 / GMP Annex 1 use cases.

Broad incumbents

• 3M: Major player in respiratory protection and occupational health products with overlapping customer base in industrial hygiene, where TSI's PortaCount fit testers are used to validate 3M respirators.
• Thermo Fisher Scientific: Global scientific instruments leader with overlapping analytical instruments, particle characterization, and environmental monitoring product lines serving pharma, life sciences, and industrial customers — making it the broadest incumbent comparable to TSI's measurement portfolio.
• Endress+Hauser: Global leader in industrial process measurement instrumentation (flow, level, pressure, analytical), with overlapping flow and analytical product lines serving industrial hygiene and process customers.
• Honeywell International: Diversified industrial conglomerate with sensing and IoT, building IAQ, and worker safety product lines (including respiratory protection through its PPE business) that overlap TSI's HVAC, IAQ, and occupational health verticals.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/tsiincorporated
• Facebookfacebook.com/tsiincorporated

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries6 records

Funding overview

Funding rounds

Investors

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

M&A1 record

Investments

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

Frequently asked questions about TSI Incorporated