One (1ea) Replacement Astron M1 LED Backlit Analog Meter for all Analog Metered models except SS-50M.
 
The RS models use the 0-15 Meter for Volts.
 
Optional LED Wiring and Diagram kit includes wires (3) for both meters, a (1) 240ohm resistor, and an LED wiring diagram. (Only one kit is necessary per power supply)