Replaceable unit for an image forming device having magnets of varying angular offset for toner level sensing

A replaceable unit (100) for an electrophotographic imaging device (22), comprising: a housing (102) having a reservoir (104) for storing toner; a rotary axis (132) that is positioned within the reservoir (104) and that has an axis of rotation; a first rotary link (141) with the axis rotating (132) about the axis of rotation, the first link (141) having a first permanent magnet (150); a second link (160) rotatable about the axis of rotation in response to rotation of the rotary axis (132), the second link having a second permanent magnet (168), The second joint (160) is rotatable independently of the rotary axis (132) between a forward rotation stop (178) and a reverse rotation stop (182) such that an amount of angular displacement between the first permanent magnet (150 ) and the second permanent magnet (168) varies depending on the rotational position of the second joint (160) relative to the forward rotation stop (178) and the reverse rotation stop (182); characterized by a spring (176) biasing the second link (160) in the direction of operative rotation of the rotary shaft (132) towards the forward rotation stopper (178).