If you know the viability of the yeast you are pitching into your wort you can be more confident your fermentation will go as expected. One of the most popular ways brewers understand how many cells they are pitching is to use a microscope and a special slide called a hemocytometer to count yeast cells. BYO’s Technical Editor Ashton Lewis walks you step-by-step through counting yeast cells using a microscope and hemocytometer. After watching this video you’ll be able to start doing your own yeast cell counts and add this valuable brewing lab skill to make better beer.