Thermo Scientific Duo Sample Handling Kits for Thermo Scientific iCap 6000 (For normal aqueous sample solutions containing relatively low acid contents (except for hydrofluoric acid) or up to 3% m/v dissolved solids. The axial view system is especially good for clean (i.e. drinking) water and some environmental samples which require the best detection limits. 842312051291 is no longer manufactured as a kit - only sold as individual parts. 842312051891 replaces 842312051291 with new EMT style torch and center tube. **Note - the EMT Torch, holder Assembly, and Center tube are not compatible with older version and vise versa.)