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https://www.facebook.com/groups/MilkTheFunk/permalink/1888017211226484/ - Under Joe I's comment
https://www.weberscientific.com/beer-spoilage-micro-test-kit-microbiologique (see [https://www.facebook.com/groups/MilkTheFunk/permalink/2031921050169432/ this MTF thread]).
===Titratable Acidity Meter===