Profile: Marks Products, Inc. is a manufacturer of video camera systems for viewing and inspecting boreholes & water wells. Our products include Geovision™ borehole camera systems, Geovision™ cameras, Geovision™ cables, monitors and recorders. Our Geovision&trade borehole camera systems is used for inspection of water wells, oil wells, mines, caves, tanks, pipes, shafts, caissons and voids. Our geovision nano camera is 3/4 inch diameter and 10 inch long camera which can operate into boreholes, wells & pipes as small as 1 inch. Nano camera can be used with either the geovision deluxe or econo systems and is interchangeable with other geovision cameras. Lighting is provided by six built in extra bright white LEDs, using a superior indirect lighting technique that improves visibility, texture and depth perception. The video camera module has a resolution of 550 horizontal lines and .2 lux, color, CCD,solid state. The lens is 2.9.mm wide angle (100°), f 2 fixed-iris with electronic shutter and associated circuitry mounted inside the camera housing which is .75"e; O.D. X 10"e; long stainless steel water proof.