DOUBLE COLOUR LIQUID LEVEL GAUGE

The utility model relates to a double-color liquid level gauge, belonging to a monitoring device, which is characterized in that a lighting window with transparent glass is arranged on the side cover plate of a casing, and a triple prism or a tetragonal prism is adopted as a prism. The red plate of the prior art is changed in to a black face plate, and the color of the lateral surface is changed from green to white or transparent. The utility model not only can clearly display the liquid level under the condition of power failure in the field, but also can display the liquid level of the pressure containers with combustible and explosive medium under the condition of no explosion proof device.