This range of Micro Fluorometer cells has been specifically designed by Starna for use with the FCA range of adaptors listed below. The adaptor locates the square cross section cell accurately in the center of the instrument cell compartment. Therefore, for a given path length, the cell is optimized for minimum volume and maximum sensitivity. All four windows and the base of the cells are polished and are available with either an open top or with a PTFE stopper supplied with the type 23- cells.