For when you absolutely, positively have to grab a sample of yeast in the pub, at a cider farm or at a festival.
https://www.amazon.co.uk/gp/product/B01M1ID5ND/?tag=skimlinks_replacement-20
https://www.amazon.co.uk/gp/product/B01M1ID5ND/?tag=skimlinks_replacement-20
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