An improved endoscopic device which is introduced into, for example, the intestinal tract of a living organism and which operates autonomously therein, adapted to obtain and store or transmit one or more types of data such as visual image data, laser autofluorescence data, pressure data, or ultrasonic waveform data. In one embodiment, the device includes one or more pressure sensing apparatus configured to enable measurement of pressure resulting from, for instance, peristaltic contractions within the intestinal tract, including transmission of pressure data as a function of time off of the device via a wireless interface while the device is within the intestinal tract.