The simplest controller ON / OFF control of three relay outputs, but with the common potential. Dedicated sensors type Pt100 or Pt 1000 or J, K, T. NTC version supplied in the price along with the NTC sensor. Power for selection of 230 V or 24 V Pt100 version 2 or 3 wire with compensation. Nice red numbers display in a black enclosure with protection against reflections. For panel mounting. Possible expansion of the communication module RS-485.