$PBIO Up to now, PBI has had one major revenue-generating business: the sale of our PCT-based instruments to research groups around the world to help bring quality to their sample preparation prior to analyzing samples as they seek to make discoveries, find cures, develop diagnostics and drugs for human, animal, and plant diseases and disorders. We have approximately 350 instruments in approximately 200 customers worldwide, including many of the top research groups in academia, government, biotech, and pharma.