Patent ID: 6983887

Claim:
An apparatus, comprising: a housing comprising a panel with an edge portion, an intermediate portion, and a window formed in the intermediate portion; a member movably secured to the housing such that a peripheral portion of the member extends from the housing adjacent the panel edge portion as the member is moved relative to the housing; indicia indicating incremental units of a first characteristic disposed on one of the panel edge portion or the member peripheral portion, and indicia indicating incremental units of a second characteristic disposed on the other one of the panel edge portion or the member peripheral portion, wherein the indicia of the respective first and second characteristics maintain an adjacent relationship as the member is moved relative to the housing by a user; and indicia indicating incremental units of a third characteristic disposed on the member and viewable through the window, wherein movement of the member by a user to align an incremental first indicia unit with an incremental second indicia unit causes display of a third indicia unit via the window.