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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
Pressure canners may have a weighted-gauge or dial-gauge, for indicating and regulating the pressure during processing.