20 mm NIR Rectangular Cell with PTFE Stopper, Quartz SUPRASIL 300,Light Path: 20 mm, Outside Dim: 46H x 12.5W x 22.5D mm, InsideWidth: 9.5 mm, Base Thickness: 1.5 mm, Cell Volume: 7.0 mL,contains two clear windows, Pkg 2. PerkinElmer offers acomprehensive range of NIR Cells, Cell Holders and Supplies. Therange includes Cylindrical Cells, Rectangular Cells, Semi-MicroCells and Micro Cells. These cells are suitable for use with allPerkinElmer NIR Spectrometers, including Spectrum™ andParagon™ IdentiCheck™ FTNIR Systems.