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We introduce a universal combination of susceptibility and correlation lengthin the 3D Ising model, depending both on temperature and external magneticfield. Starting from a parametric representation of the equation of state, westudy its behaviour close to the critical point. The results we derive can beused as a sort of "reference frame" to chart the scaling region of the 3D Isinguniversality class. More specifically, we focus on instances of Ising behaviourin finite temperature QCD and, among these, we are particularly interested onthe critical ending point in the finite density, finite temperature QCD phasediagram. In this context, Monte Carlo simulations are not possible and it isparticularly difficult to disentangle "magnetic-like" from "thermal-like"observables, thus an explicit charting of the critical region could be usefulfor a direct comparison of experimental results with QFT/Statmech predictions.

Scaling region of the 3D Ising universality class in finite temperature QCD