A medication delivery device (100, 600) comprising: a device housing including a first member and a second member wherein the first member is rotatable relative to the second member about an axis of rotation in proportion to an amount of a dose set by operation of the medication delivery device, and a third member rotatable relative to the second member about the axis of rotation in proportion to an amount of a dose delivered by operation of the medication delivery device, wherein the second member is rotationally constrained with respect to the device housing; a first rotational wiper component (185, 440) rigidly coupled, both rotationally and axially, to said first member, the first rotational wiper component including a pair of first wipers (298, 300, 454, 452) projecting in a radial direction; a second rotational wiper component (320, 442) rigidly coupled, both rotationally and axially, to said third member, the second rotational wiper component including a pair of second wipers (322, 324, 484, 482) projecting in a radial direction; a pair of electrically operable first sensing bands (260A, 260B) each having a first operational angular length fixedly coupled to said second member, and a pair of electrically operable second sensing bands each having a second operational angular length (260C, 260D) fixedly coupled to said second member, wherein each of the pairs of said first and second sensing bands are arranged in a curved shape and disposed axially relative to one another in a contacting relationship with corresponding first and second wipers, wherein, during relative rotation between said first and second members and relative rotation between said third and second members, the pairs of said first and second sensing bands are operable to generate outputs associated with relative angular positions of the corresponding first and second wipers along an operational angular length of the respective first and second sensing bands that is indicative of relative rotational positions of said first and second members and said third and second members; and a controller electrically coupled with the pairs of said first and second sensing bands to determine, based on the outputs generated by said first and second sensing bands, the amount of the dose set and the amount of the dose delivered by operation of the medication delivery device; wherein each of said first operational angular length and said second operational angular length extends only partially around a circumference of said first member; and wherein said pair of first wipers are angularly spaced from each other about the axis of rotation, and said pair of second wipers are angularly spaced from each other about the axis of rotation. a device housing including a first member and a second member wherein the first member is rotatable relative to the second member about an axis of rotation in proportion to an amount of a dose set by operation of the medication delivery device, and a third member rotatable relative to the second member about the axis of rotation in proportion to an amount of a dose delivered by operation of the medication delivery device, wherein the second member is rotationally constrained with respect to the device housing; a first rotational wiper component (185, 440) rigidly coupled, both rotationally and axially, to said first member, the first rotational wiper component including a pair of first wipers (298, 300, 454, 452) projecting in a radial direction; a second rotational wiper component (320, 442) rigidly coupled, both rotationally and axially, to said third member, the second rotational wiper component including a pair of second wipers (322, 324, 484, 482) projecting in a radial direction; a pair of electrically operable first sensing bands (260A, 260B) each having a first operational angular length fixedly coupled to said second member, and a pair of electrically operable second sensing bands each having a second operational angular length (260C, 260D) fixedly coupled to said second member, wherein each of the pairs of said first and second sensing bands are arranged in a curved shape and disposed axially relative to one another in a contacting relationship with corresponding first and second wipers, wherein, during relative rotation between said first and second members and relative rotation between said third and second members, the pairs of said first and second sensing bands are operable to generate outputs associated with relative angular positions of the corresponding first and second wipers along an operational angular length of the respective first and second sensing bands that is indicative of relative rotational positions of said first and second members and said third and second members; and a controller electrically coupled with the pairs of said first and second sensing bands to determine, based on the outputs generated by said first and second sensing bands, the amount of the dose set and the amount of the dose delivered by operation of the medication delivery device; wherein each of said first operational angular length and said second operational angular length extends only partially around a circumference of said first member; and wherein said pair of first wipers are angularly spaced from each other about the axis of rotation, and said pair of second wipers are angularly spaced from each other about the axis of rotation.