I am working on building a programmable heat treat oven for knives and need a way to accurately measure the temperature inside the oven +/- a few degrees Fahrenheit. I am leaning towards the K or N type thermocouple for the price, but the R or B type looks to be better suited, but more expensive. Been reading about different single IC's that can connect a thermocouple directly to the IC and give a reading, but most I have seen go up to 700F or 1250F which is just not high enough. The MAX31855 looks promising which can do up to 700C on a K type but would it looks like it would require I go with a more expensive thermocouple which can do the higher temperatures, but struggle at the lower temps...or maybe I read that wrong.
The temperature range I am looking to accurately read is between 200 and 2300F. Most common will be between 400 and 2000F
Is this the best IC for what I am looking to do? Any suggestions on which thermocouple I should go with? Thanks for any help in advance!