The Mesa Laboratory DryCal 800 is a metrology series high accuracy gas flow calibrator. The DryCal line is completely dry using no hazardous mercury seals and requiring no bubble solution or oil. There are 5 measuring cells that cover flow ranges from 0.5 sccm to 100 slpm, and have accuracy up to 0.15% of reading. You can measure volumetric or standardized flow in suction or pressure mode. The unit is easy to use with a large LCD touchscreen. You can interface with a PC using the free downloadable software.