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Testo is a leader in the design, development and manufacture of portable test and measurement instrumentation.

Backed by over 50 years of measuring engineering experience our mission is to provide the best quality, service and value in the industry.

In addition, Testo is recognised as the leading worldwide manufacturer of portable combustion efficiency analysers and air emission analysers.

Testo has also 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 biotech, and residential HVAC suppliers.

The company was founded in 1957 in the Black Forest region of Germany. The company has been privately owned since inception. Today, Testo consists of 24 subsidiaries and over 60 agents around the world.

The first product manufactured was a simple electronic thermometer.

Today, this product line has expanded to include a large variety of temperature measuring instruments, such as dataloggers, air velocity meters, humidity and dew point meters, refrigeration service analysers, multi-function instruments, stack gas analysers and air emission monitors, water analysers, tachometers, sound, pressure and light meters, and thermal imagers.