A material storage bin has an upright wall supporting a plurality ofvertically spacedindicators providing a person with visual information regarding the level ofthe material in thebin. The indicators have contrasting visual colors as bright yellow and darkblack surfaces thatare selectively displayed to provide a person with information of the level ofmaterial in the bin.An actuator located in the bin cooperates with a motion transmission apparatusto move visualmembers to an ON position displaying the bright color when the materialengages the actuatorand to an OFF position when the actuator is free of material in the bin.
