Universal Demountable and Semi-Demountable Cell Mount, Includes Top and Back Plates.Demountable cells will handle the bulk of your routine, day-to-day, sampling requirements. Versatility is achieved because you only need to substitute a spacer of the desired thickness to change the pathlength. The Universal Demountable Cell is supplied without windows or spacers - circular windows and spacers should be ordered separately. A thickness-compensating spacer is required for 2mm thick windows. The windows are demountable and can be easily changed and repolished when necessary. Keep a variety of spacers and window materials on hand to accommodate different types of samples.