The ornamental design for a housing for an add-on sensor for an inhaler, as shown and described.
FIG. 1 is a top perspective view of a housing for an add-on sensor for an inhaler;
FIG. 2 is a bottom perspective view of a housing for an add-on sensor for an inhaler;
FIG. 3 is a top view of a housing for an add-on sensor for an inhaler;
FIG. 4 is a front view of a housing for an add-on sensor for an inhaler;
FIG. 5 is a side view of a housing for an add-on sensor for an inhaler;
FIG. 6 is a back view of a housing for an add-on sensor for an inhaler; and,
FIG. 7 is a bottom view of a housing for an add-on sensor for an inhaler.
The broken lines in the drawings are for the purpose of illustrating portions that form no part of the claimed design. The dot-dash lines immediately adjacent to the shaded area define the bounds of the claimed design and form no part thereof. The tubular member is shown with break lines in its length, and any portions not shown between the break lines form no part of the claimed design.