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What to Look For in a Professional Espresso Machine You'll need a machine that can be controlled the pre-infusion process, which is crucial to develop flavor and aroma. Many coffee experts also search for PID temperature control in the best machines. If you plan on hiring baristas with no experience, you'll need a machine that is easy to operate and easy to instruct new staff members on. This is especially important if you're looking to run a drive-thru cafe. Ea