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Minnesota Farmers' Market Association 

Testing Cottage Foods for pH

pH Meters

pH meters measure the acidity or pH of cottage foods. There are many reliable models in the $50 to $100 range. It is recommended to use one that has at least two calibrations (left example). Some like the model on the right come with kits that also have a storage solution for the probe tip.

pH meters are calibrated every time you use them. You calibrate first, by dipping the probe tip into each calibration solution. Then to test your food sample, you insert the probe tip directly into your food sample.

If your food sample isn't a uniform mass, you will need to blend it first before testing it. For example, a salsa that is liquid with chunks of tomatoes, you'd blend that into a uniform mass first, then test.

You test your canned foods 24 hours after canning them - and write that value down in a test log like this one.

MFMA provides services, programs, and leadership that support and promote farmers' markets

across Minnesota and our Tribal Nations.

We envision a community of vibrant, profitable, and professionally managed Minnesota farmers’ markets that:

Cultivates, nourishes, and inspires a vibrant local foods community;

provides accessibility to all to local farm fresh foods;

allows local food producers to thrive and grow.

Engagement & Inclusion Director: Sina War /// /// (612) 695-6587 

Local Foodshed Database Manager: Maeve Mallozzi-Kelly /// /// (574) 310-5553

Executive Director: Kathy Zeman /// /// (507) 664-9446 

Minnesota Farmers' Market Association /// 9800 155th Street East, Nerstrand MN 55053 /// 


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