Panel meters are digital or analog meters that measure and display values in a specific range of observations or inputs. These meters are usually mounted on a flat panel or enclosure and display data readings from instruments or other sources. Panel meters can be used to measure or monitor currents, voltages, temperatures, pressure, and other types of physical, electrical, or chemical phenomena. Panel meters typically include a display such as a numerical scale, digital display, or a series of lights. Some panel meters are connected to a central control system and can be used for remote monitoring and control. Panel meters can be either single-range or dual range, depending on their design and purpose.