ELECTRO LUMINESCENT 0-30 V. Dc. METER FOR DAY / NIGHT VIEWING.      WHEN 12 V Dc. IS APPLIED  TO THE METER,  THE SCALE WILL LIGHT UP A LIGHT BLUE/GREEN FOR LOW LIGHT/NIGHT VIEWING AS SEEN IN PIC #1.  NO BULBS TO CHANGE OR BURN OUT.  MEASURES 4" W x 3 1/2" T.  NEW IN BOX.