Sierra Instruments manufactures mass flow meters, mass flow controllers, and partial flow sampling systems. The company s calibration and repair services group maintains a full staff of trained and certified calibration technicians. It has more than 25 NIST traceable primary gas flow calibration systems, all of which achieve uncertainties in the 0.2% of reading range. Each customer gets the confidence and credibility that only factory-authorized service can provide. Gas mass flow meter and controller calibration is Sierra s specialty. Choosing a calibration service for a Sierra product can be an important factor in maintaining quality assurance requirements. All calibrations are traceable to the National Institute of Standards and Technology. Typically, instruments are calibrated and returned within 10 working days. Sierra Instruments is located in Monterey, Calif.