Working with Frankenstein and those C fumes are getting mighty rare. That said wanted to see what temp the ovens running at. As suggested here there is a direct reading Tcouple in the C tube. Looking at the raw wire colors from the tube best guess is a T type because the actual wire color is copper (-) and silver (+). Not J or K types. Though I have some T Tcouples and raw wire color looks very close I don't actually have a meter. For the heck of it I did connect a K Tcouple meter to it with K wire extensions. I know very bad and evil. Read 199 uncorrected degrees. Since the range of 200 F is a small part of the overall range perhaps the offset deviation is not all that large. Uncorrected readings suggest 199 F or 91 C. At least not crazy off and I am running the oven hotter since the tube was dead. This is a regular tube not a 004 that as much as I can tell really are drained dead. Regards Paul WB8TSL