Abstract: A wedge shaped hollow float is mounted by one end to a channel bolted to the inside of the sloping roof of a grain bin approximately two feet from the top thereof. A curved rod is pivotally secured by the inner end thereof to the other end of the float and extends through the channel and through the roof and has an indicating disc on the outer end thereof. As the bin fills, the angle of repose of the grain engages the other end of the wedge shaped float and gradually lifts it as the bin continues to fill. When the indicator is fully extended, a rod and disc indicates to the operator that the flow of grain to the auger hopper should be shut off and the two foot space at the top of the bin is sufficient to hold the grain left in the auger and in the hopper thus avoiding any spillage.