The black/white two-colour gauge is an illuminated direct level indicator for steam generators. Viewed directly in front of the sight opening, liquid appears black and the steam space white.

Basic equipment includes a carbon-steel body, left- or right-hand arrangement, vent plug, IP67 illumination, A220/A240 isolation valves and AV500/AV520 drain valves. ASME materials and alternative drain valves are available.