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Kevin,
Here is a link to a site that explains the difference between the thermocouple types: https://www.instrumart.com/MoreAboutCategory?CategoryID=742&gclid=Cj0KEQiAhZPDBRCz642XqYOCpb8BEiQANUcwTyWZq5RBUZO0rrRfC-M4AGxYj7g7muRGW_8__DDxp9kaAh1q8P8HAQ&gclsrc=aw.ds
Operationally, the type K covers a wider temperature rance, but for the laminator project, the temperatures are nowhere near the limits for either type. The thermocouple type has to match the type required by the instrument you are using. The thermocouples are available with several different structures. In my case, I use a bead type that allows me to touch the rollers without conducting away significant heat. I can then get a reading with the case closed, giving me the most accurate picture of what happens in use. E-bay has the thermocouple and the instruments at very good prices. If you are going to use the bead type, order a few, because they are a bit fragile.
Harvey
Another question If I may. I have a Digi-Sense Digital Thermometer Type J Thermometer. What if any is the difference between the two Type K and Type J probesor is it internal?