Testo is a German company, founded in 1957. Their first product ever produced was a basic electric thermometer. Today their product line is extremely large, and includes dataloggers, air velocity meters, humidity and dew point meters, refrigeration service analyzers, stack gas analyzers and air emission monitors, water analyzers, tachometers, sound, pressure and light meters, and thermal imagers. They have also become a large supplier of HVAC, critical HVAC, refrigeration, airflow, and environmental monitoring instruments. Testo strives to provide the best quality and service in the test and measurement industry. They offer up to a 3 year warranty on parts and unlimited service for the life of any of their instruments.
Revenue (2012): $299 million