What Testo Sensor does

Testo Sensor GmbH is a German OEM specialist manufacturer of application-specific temperature probes and thermocouples, founded in 2010 as a wholly-owned subsidiary of Testo SE & Co. KGaA and headquartered in Lenzkirch, Germany. The company designs, qualifies, and manufactures custom temperature sensing solutions — including cable sensors, immersion probes, screw-in probes, surface probes, crossband sensors, and ceramic-sleeve probes — for OEMs in heating/air-conditioning/refrigeration, white goods (coffee machines, dishwashers, ovens, washing machines, dryers, refrigerators, water heaters), machine building, and heat/cold metering. Its underlying technology spans thermocouples and platinum resistance thermometers (Pt100, Pt500, Pt1000) as well as thermistors, with proprietary designs optimized for fast response (T63 < 1 second), vibration resistance up to 20g, dielectric strength via ceramic sleeves, and a 15-year service life target.

The company operates a direct OEM go-to-market, working with customers from specification through series production, supplemented by an e-commerce online shop offering over 1,000 standard product variants. Its revenue model is hardware sales of custom and catalog temperature probes. Operational quality is a clear differentiator: field failure rate below 400 ppm, 100% on-time delivery, hour-level traceability, and semi-automated cost-efficient production. A specialized regulatory moat underpins the heat-metering line, including EU MID (Module B) and MessEV type examination certificates from PTB, Module D production quality assurance, and country-specific cold meter approvals for Germany, Austria, and Switzerland. Distribution is direct to enterprise OEM customers globally, with logistical flexibility including Kanban, SAP-EDI, consignment, and buffer stock options.

Name

Testo Sensor

Legal name

Testo Sensor GmbH

Website

https://testo-sensor.de

Company type

Private

Founded year

2010

Operating status

Operating

Headcount range

101–250 employees

Short description

Testo Sensor GmbH is an OEM specialist manufacturer of application-specific temperature probes and thermocouples. Founded in 2010 as a subsidiary of Testo SE & Co. KGaA, it serves HVAC, white goods, machine building, and heat metering industries with over 1,000 probe variants.

Ownership category

akta.pro rank

Product category

Industrial Temperature Sensors

NAICS

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

SIC

Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Environmental Sensors (Temperature/Humidity/Gas/Air Quality) (HDAHALAD)

akta.pro secondary industries

Cold storage facility environmental sensing (rooms, freezers, blast chillers) (TLAEALAL), Test & Measurement Equipment (Oscilloscopes, DAQ, signal analyzers, calibration benches) (IMAGAFAC)

Keywords

• OEM temperature probes
• Industrial temperature sensors
• Thermocouples manufacturing
• HVAC sensor components
• Heat meter probes

Headquarters

HQ city

Lenzkirch

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. OEM Temperature Probe Sales: Manufacture and sale of custom application-specific temperature probes to OEM customers in heating, HVAC, refrigeration, white goods, and machine building industries. Includes standard product sales through online shop and custom development/production partnerships.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Testo Sensor GmbH designs and manufactures application-specific OEM temperature probes, thermocouples, and temperature transmitters for industrial customers. The company delivers the complete package from specification, design, sample/prototype construction, and qualification testing through to series production and logistics, serving HVAC, white goods, machine building, and heat metering industries with a portfolio of more than 1,000 probe configurations.

Product overview

Testo Sensor GmbH is an OEM specialist manufacturer of customer-specific temperature probes and thermocouples, founded in 2010 as a subsidiary of Testo SE & Co. KGaA. The company offers an extensive portfolio of over 1,000 temperature probe configurations across three main industry verticals: heating, air conditioning and refrigeration technology; white goods (professional household appliances); and machine building industry. The product range includes diverse probe types such as outdoor probes, room probes, screw-in probes, immersion probes, cable sensors, surface probes, crossband probes, pipe contact probes, clip probes, duct sensors, bayonet probes, ceramic sensors, and specialized probes for specific applications like heat pumps, boilers, solar systems, floor heating, air conditioning, and flue gas measurement. For white goods, they manufacture probes for coffee machines, dishwashers, dryers, instantaneous water heaters, ovens, refrigerators, and washing machines. The company also produces a dedicated line of MID-certified temperature probes for heat and cold meters, including direct installation (DS), fast-responding, and universal use (DS/PS) variants with Pt100, Pt500, and Pt1000 sensors. Their service package covers the entire product lifecycle from specification and development through sample/prototype construction, qualification testing, series production, and logistics.

Differentiator

Problem solved

Functional benefit

Products and services

• Temperature Probes for Heating, Air Conditioning and Refrigeration Technology Application-specific OEM temperature probes for HVAC and refrigeration including outdoor, room, screw-in, immersion, duct, boiler, solar, heat pump, floor heating, buffer, air conditioning, flue gas, and crossband probes designed to withstand humidity, ice, UV radiation, and extreme temperatures with 15-year service life.
• Temperature Probes for White Goods (Household Appliances) OEM temperature probes for coffee machines, dishwashers, dryers, ovens, washing machines, refrigerators, instantaneous water heaters, and penetration probes. Includes ceramic sleeve designs for dielectric strength, food-safe and drinking water compliant materials, and vibration resistance.
• Temperature Probes for Machine Building Industry Process, inline, and high temperature probes for industrial manufacturing including ceramics, glass, brick production and other harsh environments exceeding standard temperature ranges. Designed for mechanical stress and aggressive media.
• Heat Meter Temperature Probes (MID/MessEV Certified) MID-certified temperature probes for heat and cold meters per DIN EN 1434, available in direct installation (DS), fast responding, and universal use (DS/PS) variants with Pt100, Pt500, or Pt1000 sensors. Includes PTB type approval and cold meter approvals for Germany, Austria, and Switzerland.
• Testo Sensor Online Shop - Standard Temperature Probes, Thermocouples and Temperature Transmitters Configurable standard temperature probes, thermocouples, and temperature transmitters available for direct ordering via the Testo Sensor online shop, with numerous configuration options to match specific measurement tasks.
• Accessories and Pairing Services for Heat Meters O-ring tools, foldable screws for direct installation and immersion sleeve mounting, and pairing services for heat meter temperature probes.

Quantifiable outcome

• Field failure rate < 400 ppm
• +4 more outcomes

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered core and minor.

• Testo SE & Co. KGaA (Parent Company)coreStrategic or Co-development PartnerTesto Sensor GmbH was founded in 2010 as a subsidiary of Testo SE & Co. KGaA. As a subsidiary, they benefit from Testo's measuring technology expertise and brand reputation while operating with focused specialization in OEM temperature probes.
• EMATEM (European Association for Thermal Energy Metering)minorStrategic or Co-development PartnerEMATEM is the European Association for Thermal Energy Metering. Testo Sensor is an active member participating in standards committees and annual summer school lectures on heat metering technology and regulations.

Scale indicators5 records

Recent moves1 record

Expansion highlights5 records

Broad incumbents

• Testo SE & Co. KGaA: Testo SE is the parent company and a global leader in portable measuring instruments with its own temperature probe and sensor portfolio. Comparable as a related incumbent that overlaps in temperature measurement, particularly in HVAC and industrial applications.
• ifm Electronic: ifm is a German-based manufacturer of industrial sensors and automation products including temperature sensors for OEM and process applications. Comparable as a broad incumbent with overlapping temperature and condition-monitoring product lines for industrial OEMs.
• Endress+Hauser: Endress+Hauser is a global leader in industrial process instrumentation, including temperature measurement solutions for process industries. Comparable as a broad incumbent with deeper pockets, wider portfolio, and global reach that competes with Testo Sensor in process temperature applications.

Emerging players

• Baumer Group: Baumer is a Swiss-German manufacturer of sensors and instrumentation including temperature and process sensors for industrial OEMs. Comparable as an emerging player with a comparable precision-sensor approach for industrial and OEM customers.
• PT1000 Sensor Manufacturer (e.g., IST AG): IST AG is a specialist manufacturer of platinum resistance temperature sensors (Pt100, Pt500, Pt1000) and thermal probes for OEM customers. Comparable as an emerging player with overlapping sensor technology and OEM customer base in HVAC and appliance segments.

Direct peers

• JUMO: JUMO is a German mid-sized specialist in industrial measurement and control, including temperature sensors and probes for HVAC, heating, process, and appliance OEMs. Comparable as a direct competitor serving the same DACH customer base with a similar focus on application-specific sensor design.
• WIKA: WIKA is a leading global manufacturer of industrial measurement instruments including temperature probes, thermocouples, and RTDs serving HVAC, process, and OEM customers. Highly comparable as a direct competitor in OEM and industrial temperature measurement with overlapping product portfolio and similar customer verticals.

Regional players

• Güntner Group: Güntner is a European manufacturer of heat exchangers and refrigeration components that designs in temperature probes for HVAC/refrigeration applications. Comparable as a regional player in the same vertical that consumes temperature sensors in its products.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UCyXlX0m0-ec

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

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 Testo Sensor