The primary difference between Type J and Type K thermocouples is the measuring range, and the sensitivity. Type K is the most common general-purpose thermocouple with a sensitivity of approximately 41 µV/°C.
A wide variety of probes are available in its −50°C to +900°C/ -58°F to +1652°F range. Type K wire color standard is yellow (+) and red (-). Type J has a more restricted range of −50 to +400°C, but higher sensitivity of about 50 µV/°C. Type J wire color standard is white (+) and red (-).
|Immersion & General Purpose Thermometer Probe|
|J||Small||-50 to 300ºC
-58 to 572ºF
|Handle Length: 4.5" (114 mm)
Probe Length: 4" (102 mm)
Probe Diam: 2 mm
Cord Length: 40"