25 mm (about .98″) by 8 mm Teflon Magnetic Stir Bar.
Use this in combination with an Erlenmeyer Flask and Stir Plate to make a yeast starter. A stir plate… keeps yeast in constant contact with nutrients, encourages CO2 to off gas and continuously incorporates oxygen all of that means higher cell counts.
Update: Since this post was published the price, availability or promotion has changed. Check the product page for up to the minute description, price and availability. Also: Today’s Deals on Amazon
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