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Based in Chelmsford, Massachusetts, ESA is a privately held analytical instrumentation company that has enjoyed steady growth and profitability since 1972. The company manufactures innovative analytical instruments and provides complete support for a full line of chromatographic separation systems. By using basic electrochemistry to detect harmful materials in the environment, ESA has developed inventions and technologies that have played a significant role in safeguarding the health of people for more than 30 years.