A portable hand-held transluminating wand is disclosed which includes a hand grip portion containing the power source and an illumination source at a narrow terminating end. The illumination source is enclosed by a slide-on transparent cover which is shaped to permit insertion into a patient's mouth and placement against the roof of the mouth without discomfort. The translucent cover is tinted red to selectively provide light of a desired bandwidth beneficial to translumination of human tissue. The cover is clear in the region to be placed in contact with the roof of the mouth so that the light emitted in this region is not diffused but remains directed toward the roof of the mouth to facilitate translumination and frosted elsewhere to inhibit light leakage from the patient's mouth when closed about the device. The wand is constructed with a multi-position switch which permits the illumination source to be turned off and on through levels of illumination.
