An adaptation to cable diameter and being a precision measuring instrument, comprising: a tongs current the knives, the to the measuring voltage / current and of other values, wherein a end of the tongs current blade is equipped with two press handles, which in a coordinated manner can be opened and closed, and the other end of the tongs current knife is provided with two measuring ranges, which in a coordinated manner can be opened and closed, wherein the two measuring ranges, if the two press handles be pressed together, are separated and is opened, whereby the two measuring ranges on the opposite sides in each case a concave arc section is provided; and two clamping elements that can be fixed, each of which is movable with the arcuate sections of the two measuring ranges are combined, the clamping elements which can be fixed in position in each case have a base, wherein two engagement sections from one side of the base, wherein the other side with a concave first clamping portion is provided, wherein the two engagement sections of the clamping elements which can be fixed in position with the corresponding arcuate sections are combined, as a result of which the clamping elements which can be fixed in position with the measuring ranges are fastened, wherein the first clamping portions of the two clamping elements which can be fixed in position are matched to one another, wherein in the event of a respective clamping element which can be fixed in the first clamping portion with two or more interference elements is combined so as to be movable, wherein the engagement elements are arcuate, wherein one side of a respective engagement element is provided with a second connecting section, wherein the second clamping section and the first clamping portion in the same direction are curved, while the size of the inner diameter of the second clamping portions of the engagement elements from the first clamping portion of gradually decreases toward the outside.
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