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ETI 221-091 MicroTherma 1 Microprocessor Thermometer

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ETI 221-091 MicroTherma 1 Microprocessor Thermometer

ETI 221-091 Micro Therma 1 Microprocessor Thermometer accepts any type K, J, T, R, N, S or E thermocouple probe (does not include probe)

ETI 221-091 MicroTherma 1 Microprocessor Thermometer is able to measure temperature over the range of -270 to 1768 °C with a 0.1 °C resolution over the entire range. Each ETI 221-091 MicroTherma 1 Microprocessor Thermometer has an easy to read, custom 4½-digit dual LCD display with open circuit, low battery, hold, max/min and °C/°F indication.


This unit should never need re-calibrating as the built-in microprocessor enables the instrument to continuously and automatically carry out self-diagnostic re-calibration. An additional feature allows the user to adjust the reading (±2.5 °C) to offset any probe errors, correcting any inaccuracies of the thermocouple probe. Each thermometer thereafter will automatically store, display the offset and adjust the instrument for the known probe error, maximising system accuracy.


The ETI 221-091 MicroTherma 1 Microprocessor Thermometer will accept any type K, J, T, R, N, S or E thermocouple probe, the probe type can be selected through the mode button. The unit includes both max and min readings with a reset function and also has an auto-power off facility which maximises the battery life, turning the instrument off automatically after 30 minutes, this function can be disabled if not required. Other selectable parameters include: display contrast and internal CJC temperature reading.

  • range -270 to 1768 °C
  • resolution 0.1 °C/°F
  • accuracy ±0.2 °C ±1 digit
  • battery 2 x 1.5 volt AAA alkaline
  • battery life 1000 hours
  • sensor type thermocouple type K, J, T, R, N, S & E – selectable
  • display 12.7 mm LCD
  • dimensions 35 x 73 x 141 mm
  • weight 220 grams

Please note the ETI 221-091 MicroTherma 1 Microprocessor Thermometer does not include a probe.

ETI 221-091 MicroTherma 1 Microprocessor Thermometer comes complete with a calibration Certificate Traceable to National Standards when purchased new.  

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