The probe operates on a transmittance principle using IR light to track total biomass. It is a tool to increase microbial fermentation yield by maximizing the use of nutrients, gases and other critical parameters. The system reduces the cost associated with 24-hour sampling and removes inconsistent off-line analysis. The BioPAT^® Fundalux comes integrated into our BioPAT^® DCU and automatic data conversion to optical density can be achieved with BioPAT^® MFCS.