Dial gauges on pressure canners need to be tested every year to make sure the pressure is reading correctly. Gauges that read high cause under-processing and may result in unsafe food. Low readings cause over-processing. An accurate gauge is essential for safety!
UNH Cooperative Extension tests the accuracy of Presto pressure canner dial gauges. Contact the UNH Cooperative Extension Education Center at 1-877-398-4769 Monday through Friday from 9:00 am to 2:00 pm or email the Center at firstname.lastname@example.org for details.