Shop Welch Allyn: 664 Series (Size 1), 690 Series (Sizes 1-2) , 680 Series (Sizes 0-1), 692 Series (Sizes 1-2), 634 Series (Sizes 0-1), 674 Series (Size 1), 684 Series (Sizes 0-1), 694 Series (Sizes 1-2) Diagnostic Instrument Lamps