Nebraska Cooperative Extension provides dial gauge testing for pressure canners as part of educational programs on safe home food preservation. Results of dial gauge testing, conducted in a multi-county area over 25 years, demonstrate the need for annual dial gauge testing for accuracy to produce safe home processed food. Gauge testing provides Extension educators a "hook" to position themselves as the local food safety experts.
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Plate, C., & Albrecht, J. A. (2006). Home Canning: Pressure Gauge Testing. The Journal of Extension, 44(4), Article 15. https://tigerprints.clemson.edu/joe/vol44/iss4/15