A can lid having a top plate, a tab, a rivet, a score, a tongue, a first deboss, an emboss, a second deboss, and an embossed ridge. The particles either naturally fluoresce or are tagged to fluoresce when they pass through the beam. The skutcher is positioned such that the first and second pluralities of blades overlap. In an embodiment, the sheath has a hole which receives the hanger of a fuel nozzle and holds the sheath in place on the spout. The second D flip-flop receives a high level signal at a second input terminal and the first event signal at a second clock terminal and outputs a second event signal at a second output terminal.