A device for diagnosing a tissue is insertable into a patient's cavity. The device includes: (a) a housing； (b) sensors configured for diagnosing tissues within the cavity； (c) light sources having emission spectrum effective for diagnosing the tissue within the cavity； (d) a manipulating element for manipulating the light sources and sensors； (e) at least one display configured for presenting data obtained by the sensors. The manipulating element includes a first member rotatable within the housing around a first axis and a second member rotatable within the first member around a second axis. The second axis is parallel displaced relative to the first axis. The first and second rotatable members are mounted flush with each other and form a front surface, which carries the light sources and sensors facing the tissue to be diagnosed.
