Hi TechNet We monitor the concentration of cleaning chemical in our wash system by using a brix refractometer, the question has come up - how do we check the calibration of the refractometer. I'm assuming that one would use a calibration fluid, similar to verifying an Omegameter is working. My questions - what sort of calibration fluid would be most suitable for this? Can anyone recommend a good source? (prefer within Canada, but not essential) Thanks! -- regards, Graham Collins Senior Process Engineer Sunsel Systems (902) 444-7867 ext 211 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________