Verified Nov 2026
Electronics & Software
·
Sparta, Wisconsin
·
Since 1957
Testo is a manufacturer of portable and stationary measurement instruments and measurement data management systems, headquartered in Sparta, Wisconsin, United States. Founded in 1957, the company is estimated to have 1,000 to 5,000 employees and annual revenue in the $500 million to $1 billion range. It serves the automotive, electric-vehicle, electronics, construction, medical, and renewable-energy industries. Testo's emissions and sensor products are among its listed offerings, and the company has reported investment in a new modular production site in Portugal.
Testo at a glance
Revenue
$500M-1B
Est. band
Employees
1,000-5,000
Founded
1957
Headquarters
Sparta, Wisconsin
Certifications
ISO 9001
Import activity
12
Industries
Automotive
Electric Vehicles
Electronics
Construction
Medical
Renewable Energy
Sourcing and import activity
From US customs bill-of-lading records
US sea imports
12
Named foreign suppliers
4
Top origins
China · Morocco · Hong Kong S.A.R. · Chile
Shared foreign counterparties do not establish that these companies buy from Testo.
What this tells a buyer
Testo opened a new modular production site in Portugal, as reported by Batipole in October 2025, and the Portuguese outlet Jornal de Albergaria reported in September 2026 that the company aims to make Albergaria one of three pillars of its group.
Testo holds ISO 9001 certification and lists sensor and emissions measurement products in its portfolio.
Testo is privately held, so no public ticker is available, and its revenue band is an estimate rather than a reported figure.
Source: US customs bill-of-lading records and public filings · Last verified Nov 05, 2026
STABILITY SIGNALS
Established & active
69 years in operation (founded 1957).
Holds ISO 9001 certification(s) per public sources.
Overview
Testo is a manufacturer of portable and stationary measurement instruments and measurement data management systems, headquartered in Sparta, Wisconsin, United States. Founded in 1957, the company is estimated to have 1,000 to 5,000 employees and annual revenue in the $500 million to $1 billion range. It serves the automotive, electric-vehicle, electronics, construction, medical, and renewable-energy industries. Testo's emissions and sensor products are among its listed offerings, and the company has reported investment in a new modular production site in Portugal.
At a glance
Attribute | Detail |
|---|---|
Founded | 1957 |
Headquarters | Sparta, Wisconsin |
Employees | 1,000-5,000 |
Revenue | $500M-1B (estimated) |
Primary capability | Electronics & Software |
Certifications | ISO 9001 |
What Testo makes
Testo holds ISO 9001 certification and lists sensor and emissions measurement products in its portfolio.
Products and capabilities described on the company's own site include Sensor, Emissions (source: testo.com).
Certifications
Testo is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:
ISO 9001 — testo.com
Trade and customs footprint
Testo opened a new modular production site in Portugal, as reported by Batipole in October 2025, and the Portuguese outlet Jornal de Albergaria reported in September 2026 that the company aims to make Albergaria one of three pillars of its group. US customs bill-of-lading records list 12 inbound shipments across 4 foreign suppliers, with top origins including China · Morocco · Hong Kong S.A.R. · Chile.
Latest developments
2026-09-24 — Testo quer fazer de Albergaria um dos três pilares do grupo | Jornal de Albergaria (jornaldealbergaria.pt)
2026-07-16 — Capacity expansion in the calibration market: Testo invests at the Kirchzarten site - The cleanroom Portal (reinraum.de)
2026-02-19 — Testo blickt auf ein solides Geschäftsjahr 2025 zurück (testo.com)
2025-12-10 — Testo s'implante au Portugal pour se rapprocher du marché européen - Les Echos (lesechos.fr)
2025-10-17 — Testo: new modular production site in Portugal (batipole.com)
2025-09-15 — Testo Industrial Services France se dote d’une soufflerie Westenberg Engineering - Contrôles Essais Mesures (controles-essais-mesures.fr)
Facilities
Testo is headquartered in Sparta, Wisconsin. Public sources also reference these locations:
Portugal — batipole.com
Company details
Testo is privately held, so no public ticker is available, and its revenue band is an estimate rather than a reported figure. Testo was founded in 1957, has an estimated 1,000-5,000 employees, and is headquartered in Sparta, Wisconsin. On the LightSource stability read it is rated "Established & active": 69 years in operation (founded 1957). Holds ISO 9001 certification(s) per public sources.
Frequently asked questions
What does Testo make?
Testo is a manufacturer of portable and stationary measurement instruments and measurement data management systems, headquartered in Sparta, Wisconsin, United States. Founded in 1957, the company is estimated to have 1,000 to 5,000 employees and annual revenue in the $500 million to $1 billion range. It serves the automotive, electric-vehicle, electronics, construction, medical, and renewable-energy industries. Testo's emissions and sensor products are among its listed offerings, and the company has reported investment in a new modular production site in Portugal.
Where is Testo headquartered?
Testo is headquartered in Sparta, Wisconsin (Delaware Ave, Sparta, Wisconsin, 54656).
When was Testo founded?
Testo was founded in 1957.
How big is Testo?
Testo has an estimated 1,000-5,000 employees, with revenue in the $500M-1B range (estimated).
What certifications does Testo hold?
Testo lists ISO 9001 on its website. Confirm the certified scope for the specific plant producing your part.
Does Testo import from overseas suppliers?
US customs bill-of-lading records show 12 inbound shipments for Testo, with top origins including China · Morocco · Hong Kong S.A.R. · Chile.
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Last verified Nov 2026. Is this your company? Request a correction.
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