The SINDIE 7039 OTG sulfur analyzer provides reliable results from ultra low sulfur diesel and gasoline to marine fuels and crudes. This dual-use, portable analyzer uses the proprietary Monochromatic WDXRF direct measurement technique per ASTM D 7039. The standard configuration for this benchtop device measures sulfur concentrations from 1.0 ppm to 10 wt%. Its preassembled ACCU-CELL sample cups keep the sample and cup free of external contamination and particles. They also do not require various separate film and cup components to be put together. Users do not need to punch a hole in the pre-vented cups, and one 1-mL pipette fills the cup. The Monochromatic WDXRF technique does not require sample conversion, consumable gases or elevated temperature operating conditions.