A sensor adapted to be mounted to a surface has a rotatable enclosure that may be used, for example, to direct a lens of the sensor towards a window. The daylight sensor includes a photosensitive circuit for measuring a light intensity in the space, a cover portion, and a base portion adapted to be mounted to the surface. The cover portion is rotatable with respect to the base portion, for example, to direct the lens towards the window after the base portion is mounted to the surface. The base portion may also include a cylindrical wall having a channel adapted to capture a snap of the cover portion, such that the snap may move angularly through the channel to allow for rotation of the cover portion with respect to the base portion to a plurality of discrete positions.