An imaging unit placed in an access opening of a storage container that includes a mounting assembly having a base member and a plurality of support legs extending from a bottom surface of the base member, and a central through-hole, a support pole extending through the central through-hole and having a longitudinal axis, wherein the support pole is vertically movable relative to the base member, a user interface module and a power supply unit attached to a first end of the support pole and a camera unit rotatably attached to a second end of the support pole, where the camera unit rotates about the longitudinal axis and a horizontal axis and where the camera unit is rotated about the longitudinal axis and the horizontal axis to a designated position within the storage container and takes at least one image of one or more inner surfaces of the storage container.