The DynaSense® MK IV is a universal digital proportional or on/off temperature control which allows instant system setup. These controllers provide pinpoint accuracy of heating and cooling devices through the use of two position, on/off control action, operating alternately and independently with true proportional cooling algorithms. The temperature change of the input sensing devices is analyzed by a microprocessor which controls a high current, electromechanical, two position relay in direct relation to system demand and deviation from the temperature setpoint. Typical control accuracy is ± 0.2°F. Indicating accuracy is ±0.25% full scale, ±1 digit. The unit has input jacks for RTD or Thermocouple temperature probes . The mechanical relay can be replaced by a solid state relay as a option... we have single and 3 phase solid state SCR based heater load controllers from 10 amps to 1000 amps, air cooled ..Please contact us for details at 630-607-2800