Extech 7 Thermocouple Data Logger with Alarm – 421509

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The 7 thermocouple data logger can measure temperatures with 7 different thermocouples. This gives a wide range of measurement abilities. Also can log data and download it to a PC.

Extech 7 Thermocouple Data Logger with Alarm – 421509

Memory stores up to 16 data sets, 1024 maximum data capacity


  • Seven Thermocouple type selections: K, J, T, E, R, S, and N
  • Large backlit LCD with two secondary displays for simultaneous T1, T2, T1-T2, Time and advanced readouts
  • T/C offset adjustment
  • REC, MAX, MIN, MAX-MIN, AVG and switchable C and F measurements
  • Data Hold and Relative function
  • Bi-directional RS-232 PC interface
  • Programmable Hi/Lo alarm with real time clock with calendar
  • Auto power off with disable feature
  • Included with the meter:
    • Two general purpose Type-K bead wire temperature probes
    • Windows 95/98/ME/NT/2000/XP compatible software
    • RS-232 cable
    • Protective holster
    • 9V Battery
  • 1 year warranty

This meter is designed with dual inputs and can use up to 7 different thermocouple types including K, J, T, E, R, S and N. The meter has a data logging capability and can store 1024 readings with the ability to download the data to your PC for further analysis and manipulation.

With a dual display for simultaneous temperature readouts of one or both of the temperature subjects, time and other more advanced readouts. This instrument features a large range of operation from -328 to 2501°F (-200 to 1372°C). It also has an alarm feature which notifies the user of temperatures exceeding the programmable limits. The 421509 7 Thermocouple Data Logger User Manual is attached to this page to answer any further questions.


  • Thermocouple Ranges:
    • K type -328 to 2501°F (-200 to 1372°C)
    • J type -346 to 2192°F (-210 to 1200°C)
    • T type -328 to 752°F (-200 to 400°C)
    • E type -346 to 1832°F (-210 to 1000°C)
    • R type 32 to 3212°F (0 to 1767°C)
    • S type 32 to 3212°F (0 to 1767°C)
    • N type -58 to 2372°F (-50 to 1300°C)
  • Accuracies:
    • K, J, T, E types:
      • ±(0.05% rdg + 0.6°F) -58°F to 2501°F
      • ±(0.05% rdg + 1.4°F) -58°F to -346°F
      • ±(0.05% rdg + 0.3°C) -50°C to 1370°C
      • ±(0.05% rdg + 0.7°C) -50°F to -210°C
    • N type:
      • ±(0.05% rdg + 1.6°F) -58°F to 32°F
      • ±(0.05% rdg + 0.8°F) 32°F to 2372°F
      • ±(0.05% rdg + 0.8°C) -50°C to 0°C
      • ±(0.05% rdg + 0.4°C) 0°F to 1300°C
    • R, S Types:
      • ±(0.05% rdg + 4.0°F) 32°F to 3212°F
      • ±(0.05% rdg + 2.0°C) 0°C to 1767°C
  • Supplied Thermocouples: 4', type K (with teflon insulation) Max insulation temp: 500°F (260°C)
  • Battery Life: 100 hours typical
  • Dimensions: 7.5x3.6x2.1” (192x91x52.5mm)
  • Weight: 11.7oz (365g)

Unit Ship Weight: 1.5 lbs

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