Featuring two workstations producing both 312nm ultraviolet and white light the Bi-O-Vision series of transilluminators units are continuously adjustable from 100% down to 50%. The TD-1000R model offers fixed-intensity while the TVD-1000R model offers variable-intensity control of either UV or white light. This enables life science researchers to select the exact ultraviolet or white light illumination needed to photodocument samples with a single piece of equipment. They each have two adjacent workstations, each with a filter area of 8 x 8″ (20 x 20 cm). The UV side is lit by five 8-watt UV-B tubes and delivers nanogram sensitivity for detecting ethidium bromide-stained DNA or RNA. The white light side has three 8-watt fluorescent tubes that ensure excellent illumination for viewing Coomassie blue-stained protein gels, methylene blue-stained DNA gels and autoradiograms.