The meter features a large 4-digit display and custom icons. the RM-1 provides comprehensive system information including voltage, current, and temperature. A Status LED indicates charging progress and controller operating state. Three (3) battery state-of-charge LEDs provide quick reference to the level of charge on the system battery. Soft buttons allow for easy navigation of the meter menus. The RM-1 also features self-diagnostics and error reporting for troubleshooting.