Pro tip: dialing in with a cheap refractometer fixed my espresso shots

Tbh I was skeptical when I grabbed a $35 refractometer off Amazon last month. My shots at home in Portland kept tasting sour no matter what I did with grind size or dose. I tried it on three different beans and found my extraction was only hitting 14% when I thought it was around 19%. After adjusting my ratio to 1:2.5 and pulling longer, I got to 20% and the flavor balanced out completely. Has anyone else used one of these to troubleshoot, or do you just trust your taste buds for everything?

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