Freezer failure indicator

A freezer failure indicator assembly comprising an indicator unit and an open channel support bracket therefor wherein the indicator unit is in the form of a closed container defined by walls forming an internal cavity containing a quantity of a liquid having a freezing point selected so that it will be frozen at normal operating temperatures of a freezer with which it is to be used and wherein the walls of the container have an opaque zone and a transparent zone arranged to enable the liquid to be pre-frozen within the opaque zone followed by re-orientating the container relative to the bracket to render the transparent zone of the wall visible, devoid of any liquid in such zone, and lower than the pre-frozen liquid, and wherein thawing of the pre-frozen liquid causes it to move to become visible through the transparent zone, wherein color imparting means are carried by the bracket that operatively supports the indicator unit so as to be visible through the said transparent zone in the operative position thereof to thereby impart a first color to the transparent zone in the absence of any liquid being present in the transparent zone and wherein the liquid is rendered opaque so as to obscure such first color imparting means when the liquid is present in the transparent zone, the liquid having a second color chosen to provide a color indication distinctly different from said first color when the liquid is present in the transparent zone.