What to Look For in a Professional Espresso Machine You'll want a machine that has the ability to control the pre-infusion process, which is crucial to develop flavor and aroma. PID temperature control is also an attribute that many coffee experts search for in an espresso machine that is professional. https://www-coffeee-uk52992.ssnblog.com/29296066/15-reasons-why-you-shouldn-t-be-ignoring-buy-espresso-machine