Duo Organics Kit. (For sample solutions containing relatively non-volatile organic solvents, such as xylene, toluene, white spirit and kerosene. The Duo option is not recommended for use in lubricating oils analysis, especially of wear metals in used oil. Dedicated radial view ICP systems are likely to be better suited. 842312051201 is no longer manufactured as a kit - only sold as individual parts. 842312051801 replaces 842312051201 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. )