The present study evaluated longitudinal invariance (LI) and transient error (TE) in the Emotional Fatigue Scale (EFS) in a sample of 116 psychology students (79 women, M age =23.88) from a private university in Lima metropolitan area. LI was assessed using confirmatory factor analysis, and TE using indicators based on observed scores (e.g., reactive test) and latent variables (e.g., omega hierarchical by subscale). Results indicate that, at least with the sample from the present study, the measurement performed by EFS remains invariant and acceptable over time. It was concluded that EFS would be useful in pre- and post-test projects, as well as in empirical studies, in which it could provide stable results. Some limitations and future research perspectives are discussed.