The sensitivity of a dual-axis K-Rb-21Ne co-magnetometer is subject to the accuracy of the magnetic field compensation and the calibration coefficient. which are determined by the orthogonality of the coil system. In this paper. an ingenious method of measuring the non-orthogonal angles between the x- and z-axes coils and that between the y- and z-axes coils is demonstrated. https://ashleyshomestores.shop/product-category/accent-cabinet/