  In the framework of local thermodynamic equilibrium by Buchholz, Ojima and
Roos, a class S_x of observables, whose members are supposed to model idealized
measurements of thermal properties of given states at spacetime points x, plays
a crucial role in determining and characterizing local equilibrium states in
quantum field theory. Here it will be shown how elements from this space can be
reproduced by a specific model of the idealized measurements modeled by an
Unruh-de Witt detector.
