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Canning -- Equipment
How often does a Presto Canner Tester have to be calibrated?
Presto representatives say that the master gauge on their testers (either the old electric ones or the new air-pump type) should be calibrated each year. If the unit is dropped or jostled, then the unit will need to be calibrated again.
The new air-pump type tester comes in a foam-lined index card box. This box is to be used to mail it to Presto for calibrating. One needs to pay to mail the tester to them, the testing and return of the tester is free. A sketch of the tester is available at: http://www.uga.edu/nchfp/educators/Prestotester.pdf
SOURCE: Angela M. Fraser, Ph.D., Associate Professor/Food Safety Education Specialist, NC State University