I wrote: >>Owning standards and instruments with traceable calibrations is >>necessary but not sufficient for making traceable calibrations with >>them. For a calibration to be traceable, the lab that did the >>calibration must be accredited. David responded: >[Lab] is NIST tracable and acredited. I would not trust them to >calibrate a 3.5 digit DVM! There are a number of things I have seen >cal certificates from them, which I don't believe they can calibrate. Good point. I did not mean to suggest that being traceable and accredited necessarily makes a calibration lab good at what it does, or instills upright business ethics. Best regards, Charles