The Sontex 556 is the Sontex 566’s predecessor. Its popularity is due to the bidirectional radio system; it transmits the required consumption data only when actually requested to do so and thus avoids creating unnecessary electro smog.


  • Single or two-sensor measurement method.
  • Unit or product scale, to be defined according to the billing
  • User-friendly operation by push button.
  • Optical interface for readout and parametrisation.
  • Several device programming and reading software tools
  • Lithium battery with a typical lifespan of 10 + 1 years