The electronic phase diagrams of highly correlated systems, particularly of a variety of non-conventional superconductors, have been described in the context of an intertwining of multiple orders [E. Fradkin et al., Rev. Mod. Phys.  87 (2015) 457].  A cutting edge topic has emerged from the observation of strongly anisotropic electronic states in both cuprates and Fe based superconductors along with theoretically suggested coupling between nematic and  superconducting order parameters. It has been established that the symmetry breaking in Ba(Fe_1−xCo_x)₂As₂ is consistent with the existence of a true nematic phase, with evidence of divergent nematic susceptibility [F. Kretzschmar  et al., Nat. Phys. 12 (2016) 560; H-H. Khuo et al., Science 352 (2016) 960]. This magnitude is generally measured by means of elastoresistivity experiments, a powerful technique involving a number of non-trivial technical challenges. Recently, a novel piezoelectric-based apparatus to achieve large sample strains at cryogenic temperatures, with compensation of undesirable piezoelectric thermal deformations, was designed [C. W. Hicks  et al., Rev. Sci. Instr. 85 (2014) 065003]. In a recent collaboration, such device was installed to perform absolute strain elastoresistiviy measurements at low temperatures and orientable magnetic fields, in the Low Temperature Laboratory of FCEyN, UBA, and we have examined the interplay between nematicity and superconductivity. Here we present recently published results [J. Schmidt  et al., Phys. Rev. B 99 (2019) 064515], where we show evidence of nematic effects in the mixed superconducting phase of slightly underdoped Ba(Fe_1−xCo_x)₂As₂. Elastoresistivity measurements were done under a rotating magnetic field and the analysis of the angular dependence of physical quantities identifies the cases in which the sample is a detwinned single domain. Moreover we were able to evaluate the effects of nematicity on the in-plane superconducting stiffness. Our results show that although nematicity contributes in a decisive way in the conduction properties, its contribution to the anisotropy properties of the stiffness of the superconducting order parameter is not as significant in these samples.