Our unique production methods and dedication to quality, combined with unparalleled service and support, have defined Calgaz as the standard for calibration. Wherever you are, whatever your application, you know you can rely on Calgaz. Calgaz calibration gases in non-refillable cylinders and our full line of regulators are manufactured in Cambridge, Maryland, USA at our state-of-the-art production facility. Calgaz is a wholly owned subsidiary of Air Liquide, the world's largest industrial gas company, operating in more than sixty countries.