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Pressure canners may have a weighted-gauge or dial-gauge, for indicating and regulating the pressure during processing.
Water bath canners have fitted lids and removable wire racks. While they come in many sizes, the canner must be deep enough to allow a minimum of 1-2 inches of briskly boiling water that covers the top of jars during processing.
Dos and Don't s on canning on a smooth stovetop