Last November I spent an entire brew day at 21st Amendment Brewery in San Francisco with head brewer Zambo. After I became executive director of the San Francisco Brewers Guild in September 2012, I decided it would be a good idea to spend a full day with each brewer while they’re working. It’s an opportunity for me to learn about their beer, process and I take a bunch of photos for promotional purposes. They can also put me to work or I’ll just try and stay out of way.

In the photo above Zambo is using a refractometer to measure the level of sugar in beer wort. It can also be used to track fermentation.