A display device configured to realize a high display quality by correcting irregularity, caused by a lighting unit, by signal processing. The switching method comprises selecting a new stimulation parameter set, and setting the initial stimulation levels to levels at or just below an estimated perception threshold of the patient. The gage is adapted to indicate the clearance between a pitch change link ball bearing and a pitch change link knuckle in the axial direction andor in the radial direction. When the rail guided vehicle travels on the one travelling rail toward the first branching side and travels straight on the other travelling rail, the height adjustable roller on the side opposite the branchingmerging side takes the advanced position, and when travels on the branchingmerging side, the rollers take the intermediate position. The present disclosure also provides compositions and methods for facilitating the correct insertion of a sensor into a corresponding analyte meter.