Which of the following displays an electrical quantity as a numeric value?

A meter is an instrument specifically designed to measure and display an electrical quantity, such as voltage, current, or resistance, as a readable numeric value. Modern digital multimeters display these values on an LCD screen, while older analog meters use a physical needle moving across a printed numeric scale. The other options listed are active or passive electrical components that perform functions within a circuit, not measuring or display devices. A potentiometer is a variable resistor, a transistor is a semiconductor used for switching or amplification, and a relay is an electrically-controlled switch.