Products and services Endress+Hauser offers a comprehensive range of FOUNDATION Fieldbus devices and a multitude of supporting services. Promass K, Promass O, Promass P, Promass Q, Promass S, Promass X, Prosonic Flow 91, Prosonic Flow 92, Prosonic Flow 93, Prosonic Flow G, Prowirl D, Prowirl F, Prowirl O, Prowirl R, t-mass, t-mass A, t-mass B, T-MASS F, T-MASS I, Promass I, CNGmass, Dosimag, Dosimass, LNGmass, LPGmass, Promag 10, Promag D, Promag E, Promag H, Promag L, Promag P, Promag W, Promass 40, Promass 80, Promass 83, Promass 84, Promass E, Promass F, Promass H Provides digital communication over two-wire architectures.