Hi all, hoping someone can help me on inhouse freezer calibrations. we are under SQF stds. Our freezers are -18C and our product is 200litre drums of vegetable concentrate which will stay frozen for a good while. What i am trying to do is use dry ice with a nata certified thermometer against our freezer probes and record what our control panel reads. Issue is the dry ice will be at -78.5C which is no where near our -18C. Does anyone have a procedure or another way to go about doing this? Any help would be appreciated. Carol
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