Ideal for any fish study as well as for use with our Ann Arbor™ roller press. An effective way to make permanent records of fish scale sizes. Each slide is made from clear cellulose acetate plastic in your choice of 2 sizes and 4 thicknesses and is easy to observe and measure both by bright field and dark field illumination. After the fish scale impression is made on the roller press, write essential data or codes directly on the plastic slide with a fine point permanent marker.