A gas sampler device has a top plate with a concaved outer wall. The first stage comprises an electromechanical switch, by means of which a first or second voltage range may be selected. For example, the power supply may activate only an uncoupled phase path during light-load conditions, may activate only coupled phase paths during moderate-load conditions, and may activate both coupled and uncoupled phase paths during heavy-load conditions and during a step-up load transient. The inserter is provided with a plurality of arms that securely engage a plurality of indents on the edge or periphery of the implant. The pin load applicator permits the force being applied by the skull pin to be adjusted to a desired value; and thereafter, the pin load applicator is removed from the skull pin assembly without changing the desired skull pin force. The light-emitting module according to the embodiment includes a substrate including an arrangement surface on which the light-emitting elements are arranged, the different kinds of light-emitting elements being alternately arranged in a plurality of directions on the arrangement surface.