The FWZ Series AC Hour Meters are flush panel mountable designed to fit into tight locations. They are non-resettable and flush panel mounted with watertight/dust-tight sealed bezels designed to withstand IP54 environmental rating (with use of a gasket). All models are black plastic (except FWZ72B which is blue-silver on colorless frosted polycarbonate)with white numerals on a black background. Tenths and hundredths numerals are yellow.