It is just the materials used in the thermocouple and the output for whatever temperature you are reading.i think the k type can withstand higher temperatures but a j is good for at least 500 degrees
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Thursday, December 29, 2016 12:11 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Temp upgrades of lam's
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 probes
or is it internal?