Special Features:

With 6 slots 0.090 x 0.090 in. Equal spaced; paint 2 faces matt black; an area at lower middle half to be colored pink, fed specification 595 31668 on face a with ltrs purge underneath; an area at upper middle half to be colored blue, fed specification 595 35231 on face a with ltrs normal above; characteristics and outlines of colored areas to be engraved and filled black on face a

Properties:

A piece of transparent material specifically designed to be placed directly in front of a dial or scale to protect it from foreign matter. It is cut to size and may include a frame. It may have an index line or other marking. See also window, observation; and dial, scale.