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Essco Calibration Laboratory was founded in 1961 and purchased by Walsh Engineering Services, Inc., in 1974. Over the past four decades, the Walsh family has grown Essco from five people to more than 60. Today, we operate out of a modern 22,000 square foot facility in Chelmsford, Mass., that features four environmentally controlled labs. Between our full-service calibration laboratories and onsite work at client facilities, we complete 95,000+ electronic, mechanical and dimensional calibrations a year. New England's largest and most diverse calibration laboratory, we service about 2,000 businesses throughout the United States and abroad.