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What to Look For in a Professional Espresso Machine You'll want a machine which can control the pre-infusion, which is essential for establishing flavor and aroma. PID temperature control is a feature that coffee experts are looking for in a professional espresso machine. If you're planning on hiring baristas who have no experience, you'll need a machine that's easy to use and easy to train new employees on. This is especially crucial for those who want to run a drive-thru