The O2k-NADH-Module uses NAD(P)H autofluorescence to evaluate the redox state of the NAD(P)H-pool. It incorporates a UV light and NADH-Sensors which include a photodiode and specific filters.
The O2k-NADH-Module is only compatible with the NextGen-O2k main unit.
See which O2k-Packages include it as a standard component here.