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Thermocouple Probes

Optional Type K Thermocouple Probes

  • Hundreds of probes to choose from
  • Penetration, surface, high temp, wire, and more
  • Select coiled or flat cables with optional extended cable lengths

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General Purpose

High Temp




Probe Accessories

Optional Type T Thermocouple Probes

  • Hundreds of probes to choose from
  • Penetration, surface, high temp, wire, and more
  • Select coiled or flat cables with optional extended cable lengths
Select Category to View Probes

Lab Probes
0.1°C Accuracy

0.2°C Accuracy

Probe Accessories

  • Most probes assembled by hand in the UK
  • Professional grade thermocouple wire
  • Typical accuracy to ±0.9°F (±0.5°C)
  • Response times to 2 seconds full range
  • Over 100 standard probe assemblies
  • Liquid, air, gas, solids, and surface type probes
  • Customize length, cable, and probe tips
  • Multiple handle types for convenience during use

Thermocouples are the most widely used electronic temperature sensor. Their advantages include reasonable cost, wide variety of styles, wide temperature ranges, normally fast speed and better durability than other sensor types.
The probes shown on these pages are stocked in type K thermocouple material. If you want to order any of these probes in type J or type T, please call and tell us which model you're interested in and we'll provide a part number.

ThermoWorks certifies that our Type K probes have been tested, inspected and found to conform to an accuracy of ±0.5°C over the range of 0°C to 100°C.

Many probes can be ordered with a flat cable or a coiled, retracting cable. Standard cable length is 39" (1 meter) unless otherwise indicated. We can also supply longer cable lengths on request and custom probe lengths or diameters. Custom probes or other thermocouple types generally require about 3 weeks for delivery.

Call for advice!

Range Dependent on thermocouple type:
J: –292 to 2192°F (-180 to 1200°C)
K: –418 to 2501°F (-210 to 1372°C)
T: –418 to 752°F (-210 to 400°C)
Accuracy Dependent on thermocouple type:
J: ±1.8°F (1.0°C) from 32 to 212°F (0 to 100°C)
K: ±0.9°F (0.5°C) from 32 to 212°F (0 to 100°C)
T: ±0.4°F(0.2°C) from -4 to 158°F (-20 to 70°C)


What does the Time Constant specification mean?

As defined by engineering sciences, a time constant is the actual time that a physical system requires to reach 62.3% of its total value. After 5 time constants, the system is considered to be at 100% value.

How do you translate 1 time constant into the time it takes a temperature probe to reach the full value of the system being measured? Multiply the time constant specification by 5 to get the time to reach full value. Here's a typically example:

Time Constant = 0.5 seconds (typically given for liquid measurements)
Time to reach full value (100%) = 0.5s x 5 Time Constants= 2.5 seconds

Results can vary with the medium being measured. Thermally speaking, liquids transfer heat faster than air so sufficient time must be allowed for the probe sensor to reach thermal equilibrium with the air. Moving air will be faster than standing air or room/ambient temperature measurements.

What is Accuracy?

NIST defines accuracy as: closeness of the agreement between the result of a measurement and the value of the measurand or "true value".

Thermocouple accuracy is typically defined by the type of wire used, i.e. Standard Limits of Error (4.0°F) and Special Limits of Error (2.0°F). Unless otherwise noted, ThermoWorks employs high performance thermocouple wire with tighter tolerances than Special Limits of Error wire over common industrial ranges in its probe construction. Probe tolerances are listed below:

Type Description Temperature Range ThermoWorks Probe Tolerances
K Nickel Chromium/Nickel Aluminum
-346 to 2500°F
(-210 to 1372°C)
±2.7°F (1.5°C) from -40 to 32°F (-40 to 0°C)
±0.9°F (0.5°C) from 32 to 212°F (0 to 100°C)
±2.7°F (1.5°C) from -148 to 631°F (-100 to 333°C)
±0.4% from 631 to 1832°F (333 to 1000°C)
T Copper/Constantan
-346 to 752°F
(-210 to 400°C)
±0.9°F (0.5°C) from -40 to -4°F (-40 to -20°C)
±0.4°F(0.2°C) from -4 to 158°F (-20 to 70°C)
±0.9°F (0.5°C) from 158 to 257°F (70 to 125°C)
±0.4% from 257 to 662°F (125 to 350°C)
J Iron/Constantan
-292 to 2192°F
(-180 to 1200°C)
±2.7°F (1.5°C) from -40 to 32°F (-40 to 0°C)
±1.8°F (1.0°C) from 32 to 212°F (0 to 100°C)
±2.7°F (1.5°C) from 212 to707°F (100 to 375°C)
±0.4% from 707 to1382°F (375 to 750°C)

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