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||Large||-50 to 400ºC
-58 to 752ºF
|Dimensions||Handle Length: 5.2" (133 mm)
Probe Length: 6" (152 mm)
Probe Diam: 3 mm
Cord Length: 40"