The UV Quartz SUPRASIL Semi-Micro Cells are widely used in routine UV/Vis analysis. They have the same outside dimensions as Macro cells, but their cell walls have been thickened slightly, limiting the interior sample chamber width to 4 mm with a base thickness of 3.2 mm. Each cell has two clear windows. Semi-Micro cells have either a lid or a stopper. While the outside dimensions of Semi-Micro cells with Stoppers differ slightly from those with Lids, the path length and volume are not affected. UV Quartz SUPRASIL is a quartz of the highest purity and homogeneity. An empty UV Quartz SUPRASIL cell gives a transmission of more that 80% over a spectral range of 200 - 2,500 nm. These cells are identified by a blue PerkinElmer logo.