An apparatus for operating an endothelium reflection microscope. In order to provide the encoding system, the maximum number of bits Tmax is set for each VOP, and the output of encoding unit and the output of fixed code output unit is switched and outputted so that the number of bits Sc of the VOP may not exceed the Tmax. A receiving unit may have an integral base affixed to an adjustable band, clothing or motorcycle, and that receiving unit is detachable from the base for charging andor programming. The apparatus further includes a second, upper, gripping mechanism locatable subsea in the vicinity of the subsea borehole, the second gripping mechanism being capable of-gripping a portion of the sting of tubulars.