LED replacement lamp for the #47 and #51 used as indicators etc. Voltage 6.0-6.3 AC/DC.. Same basing as the #47 and #51 and lasts almost forever. No heat to ruin meter parts. Brighter than regular panel lamps. Specifiy color. White, Blue, or Green. Installing one is as easy as replacing an incandescent lamp. $3. 50 each. J W7KSG