World Leader in Measurement Technology

Company Information

Testo is a world leader in the design, development, and manufacture of portable test and measurement instrumentation and solutions. Backed by 60 years of measuring engineering experience, our mission is to provide the best quality, service, and value in the industry. In addition, Testo is recognized as the leading worldwide manufacturer of portable combustion efficiency analyzers and air emission analyzers. Testo has become a major supplier of HVAC, critical HVAC, refrigeration, airflow, and environmental monitoring instruments for markets as diverse as chemical, food service and production, pharmaceutical and biotechnology, and residential HVAC suppliers.

The company was founded in 1957 in Lenzkirch, in the Black Forest region of Germany. Testo has been privately owned since its inception. Today, Testo consists of 33 subsidiaries and over 60 agents around the world.

Testo North America, the United States subsidiary, was founded in 1981, and is headquartered in West Chester, PA, home of the Testo Solutions Division.  Testo North America (Instrumentation Division) is located in Sparta, NJ.

Testo's first product manufactured was a simple electronic thermometer. Today, the product line has expanded to include a large variety of temperature measuring instruments, such as data loggers, air velocity meters, humidity and dew point meters, refrigeration service analyzers, multifunction instruments, stack gas analyzers and air emission monitors, water analyzers, tachometers, sound, pressure, and light meters, and thermal imagers.

Testo offers NIST calibrations (where applicable) on all instruments, as well as ISO 9001 quality standards, and up to three year warranties on parts, plus service for the life of the instrument.


Our passion, your peace of mind. Be sure with innovative measurement solutions from Testo.