Pressure Canning low acid foods. Learn the food safety reasons for pressure canning and how to use the different types of pressure canners on the market. 1st of a 4-series class by Cornell Cooperative Extension. Costs $20 or $15 each if you take 2 or more. Registration is required, contact or 518-765-3552. From 5:30 to 8:30 p.m. at 24 Martin Road, Voorheesville, NY 12186