A theoretical revision, motivated by experiments performed in a wide range of frequencies (0.4 GHz<f<4 GHz), leads to the accurate prediction in a greatly extended domain of the densities at which temperature (Tonks–Dattner) resonances occur in a plasma column. It is shown that a two-fluid scalar perturbed pressure plasma description using the radial density profile determined from positive column plasma discharge theory perfectly explains the experiments at low densities, a domain within which Parker, Nickel, and Gould [Phys. Rev. Lett. 11, 183 (1963); Phys. Fluids 7, 1489 (1964)] have computed the corresponding theoretical curves for the first two resonances. Introducing new dimensionless parameters, a new representation of these curves is developed, which results in a general linear law permitting a direct comparison with experimental results over a much wider density domain than was previously the case. Moreover this new law permits the direct measurement of the electron temperature and of the average density independently of each other using the plot of a single resonance.