Extech 421509
7 Thermocouple Dual Input Datalogger with Alarm

  • Seven Thermocouple type selections: K, J, T, E, R, S, 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 °C/°F switchable
  • Data Hold and Relative Function
  • Built-in bi-directional RS-232 PC interface
  • Real time clock with calendar
  • Selectable auto power off function, disable capability
  • Complete with two Type-K bead wire temperature probes(-4 to 482°F /-20 to 250°C), Windows®95/98/ME/NT/2000/XP compatible software, RS-232 cable, protective holster, and 9V battery
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Extech 421509 Shown
Product Information
Datasheet 190 KB
Manual 321 KB
PDF Help
Ordering Information
Model Description Buy Online Price
421509Extech 421509 Thermometer Dual JKTE RSN w/RS-232 Software Buy Now$209.99
421509-NISTExtech 421509-NIST Thermometer Dual JKTE RSN w/RS-232 Software and NIST Calibration Certificate Buy Now$309.99
Included Accessories
  • 1 - 9V battery
  • 2 - Bead wire temperature probes
  • 1 - Manual with Quick Basic PC communications program
  • 1 - Protective holster
Optional Accessories
801515 Extech 801515 Probe, Temperature J General Purpose Buy Now Sale $37.83
(Reg. $43.99)
872502 Extech 872502 Temperature Bead Wire Probe with subminiature Type J connector Buy Now Sale $12.63
(Reg. $15.99)
871515 Extech 871515 Temperature Probe, K Type (General Purpose) Buy Now Sale $31.91
(Reg. $41.99)
881605 Extech 881605 Type K, 6 General Purpose Probe, (1472 Deg F/ 800 Deg C) Buy Now Sale $35.03
(Reg. $47.99)
881602 Extech 881602 Type K, 6 Surface Probe, (1472 Deg F/800 Deg C) Buy Now Sale $48.95
(Reg. $67.99)
881603 Extech 881603 Type K, 6 Immersion Probe, (1472 Deg F/800 Deg C) Buy Now Sale $35.03
(Reg. $47.99)
TP200 Extech TP200 Type K Pipe Clamp Temperature Probe Buy Now Sale $36.07
(Reg. $40.99)
TP400 Extech TP400 Type K High Temperature Pipe Clamp Probe Buy Now Sale $73.03
(Reg. $82.99)
TP870 Extech TP870 Bead Wire Temp Probe Buy Now Sale $12.63
(Reg. $15.99)
TP873 Extech TP873 Bead Wire Temperature Probe Buy Now Sale $10.87
(Reg. $15.99)
TP875 Extech TP875 High Temp Probe 1000 F W/Alligator Clips Buy Now Sale $26.99
(Reg. $35.99)
TP882 Extech TP882 Type K High Temperature General Purpose Penetration Probe Buy Now Sale $32.84
(Reg. $44.99)

*NOTE: Items ordered with optional NIST calibration will require
approximately 10 days to complete the certification.