Which component is NOT part of a grinder?

The pressure gauge is not a component of a grinder. Grinders typically consist of essential components such as burrs, which are crucial for the grinding process; a whole bean hopper, which holds the beans before grinding; and a pulse button, which provides the ability to control the grinding duration manually.

The burr is essential for achieving a consistent grind size, which is vital for extracting optimal flavor from coffee. The whole bean hopper ensures that you can grind fresh coffee as needed, preserving flavor and aroma. The pulse button enables users to grind the coffee in short bursts, allowing for better control over the grind size and consistency. In contrast, a pressure gauge is generally associated with brewing methods such as espresso machines, where it measures the pressure during extraction but is unrelated to the grinding process itself.