According to the present invention there is also provided an apparatus for estimating the fiber fineness of a known mass of fibers, the apparatus including: an image capturing device for capturing either i) all of the fibers selected for testing or ii) a fraction thereof, in one or more images; a computer capable of automatically determining the total length of fiber or fibers in the or each image; and a means for estimating the fiber fineness of the fibers using the total fiber length in the image(s).