The utility model provides a simple and easy portable cable eccentric measurement appearance. Its isosceles triangle board for adopting the high transparent material of polystyrene to make, every limit edge is equipped with the scale, and the eminence on isosceles triangle board base is equipped with vertical standard scale, and the position that the lower part is on a parallel with isosceles triangle board base is equipped with the horizontal reference chi to vertical standard scale and horizontal reference chi are nodical for centre of a circle department is equipped with circumference anglechi, and circumference angle chi comprises the multiunit concentric circles, are equipped with 360 scales on the circumference. The utility model discloses the effect: than present on -the -spot perusal, ruler, tape measuring's method is more accurate reliable. Can be used to quick, conveniently measure insulating layer thickness, circular object, pattern, figure radius, can confirm circular object centre of a circle position. Use the high transparent material of PS, make things convenient for accurate reading, the light portable of matter, and it is wear -resisting difficult ageing, the scale is difficult for droing to it is not fragile to possess certain elasticity. Appropriate cable construction site environment can directly measure on cable section.