Pressure canner and Pressure cooker

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http://foodsafety.wisc.edu/consumer/fact_sheets/pressurecannerandcooker.pdf

Bottom line:
Pressure canners and pressure saucepans come in a wide variety of sizes. Pressure canners may hold up to 22 Quarts of canned food, and are able to process food at pressures up to 25 pounds. Some popular brands of pressure canners are Mirro, Presto, and All American. Pressure cookers usually hold no more than 4 to 6 Quarts,
and they may, or may not, have a way to regulate the pressure. Some pressure cookers come equipped with a weight to cook at 5, 10 or 15 pounds of pressure, while others have no way to regulate pressure settings, or simply have settings of ‘low’, ‘medium’ and ‘high’. Pressure cookers do not come with pressure gauges, and they cannot be safely used to can foods.
 
A canner has room for at least 4 quart jars, standing upright. It also has an adjustable weight so the canner can be set for 5, 10 or 15 pounds pressure.

You can cook in a pressure canner---I make stock in mine all the time. You cannot can in an electric pressure cooker, except for the one Ball makes, which only does high acid foods.
 
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