Tetra Industrial and Technical Systems Foreign Trade Inc. is an engineering company mainly active in the field of Process Monitoring and Environmental Analysis Systems. At present, TETRA Foreign Trade Inc. is the head of a group of companies, which work dedicatedly on specialized subjects and support each other in the market. 2 of these are: On-line water analysis and monitoring systems and on-line air analysis and monitoring systems. TETRA is representing Air Quality Division of Thermo Fischer Scientific in Turkey. Thermo Fisher Scientific is the world leader in serving science. The company enables its customers to make the world healthier, cleaner and safer by providing analytical instruments, equipment, reagents and consumables, software and services for research, analysis, discovery and diagnostics. With annual sales of more than $10 billion, Thermo Fisher Scientific has more than 30,000 employees and serves more than 350,000 customers in pharmaceutical and biotech companies, hospitals and clinical diagnostic labs, universities, research institutions and government agencies, as well as environmental, industrial quality and process control settings. Tetra is highly experienced in implementing systems designed to meet the needs of air quality monitoring systems. Some of our references in Turkey are Tubitak Research Council, Tupras Refinery, many municipalities, industrial zones, environmental managements of government, etc..