The best replacement for thermocouple is rtd.

The best alternatives to thermocouple are rated as following:
★★★★★  rtd
★★★★  thermistor
★★★  thermopile
★★  thermometer
★  flame sensor
★  pt100
★  infrared thermometer
★  rtd response time
  gas valve
  pyrometer
  temperature probe
  ungrounded thermocouple
  k thermocouple
  thermostat
  thermistor thermometer
  transducer
  rtd sensor

Your alternative for thermocouple is not listed? Suggest!
Speaking about thermocouple, one probably shouldn't forget about thermowell.

Other search terms related to thermocouple and their ratings are:
★★★★★ thermowell
★★★★ multimeter
★ meter
You have in mind a companion for thermocouple and it is not yet here? Propose!



Google Trends

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thermocouple
rtd
thermistor