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/ degrees C. A wide variety of probes are available in its −50 degrees C to +900 degrees C / -58 degrees F to +1652 degrees F range. Type K wire color standard is yellow + and red -. Type J has a more restricted range of −50 to +400 degrees C, but higher sensitivity of about 50 μV/ degrees C. Type J wire color standard is white + and red -. Specifications Surface Probe Type Application Temperature Range Dimensions K Magnetic, for use on stationary metal surfaces -50 to 250 degrees C-58 to 482 degrees F Probe Length: 1.7 44 mmProbe Width: 10 mmMax Cord Length: 45 Comparison Chart Comparison Chart
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