Essco Calibration Laboratory provides calibration services for a wide variety of commercial test equipment.Capabilities include electronic, mechanical, fiber-optic, temperature,pressure,mass flow and torque instrumentation. The company is accredited to ISO/IEC 17025. All calibrations are traceable to NIST. Our ~90 employees represent one the the largest independent calibration facilities in the United States. We perform approximately 50 percent of our calibrations onsite and the other 50 percent at our state of the art laboratory's in Chelmsford, Massachusetts. Essco has over 3,500 customers throughout the United States and 15 foreign countries.