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 (-).
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