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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 to develop aroma and flavor. Many coffee experts look for PID temperature control in the best machines. If you plan on hiring baristas without much experience, you'll need a machine that is easy to use and easy to instruct new staff members on. This is especially important when you're planning to operate an drive-thru coffee shop. Easy to Use This profe