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What to Look For in a Professional Espresso Machine You'll want a machine which can be controlled the pre-infusion process, which is crucial for developing aroma and flavor. Many coffee experts look for PID temperature control in the best machines. If you plan on hiring baristas who have no experience, you'll need a machine that's easy to use and easy to instruct new staff members on. This is important if you plan to run an open-air coffee shop. Ease of Use As you may have guessed from its name the professional espresso machine is designed to be sim