I just bought two thermocouples from amazon the are "rated" to 1250C(2282F) each less than $15 i used cheap amazon ones last year and the one in my burn chamber peaked as high as 2100F but I have to replace it again this year the stack temp one is good i believe. no they are not going to last more than a season or two but. Compare that to ones that will survive with costs in the hundreds of dolla rs rangeit will get the job done