Need help in creating a tech article..measuring heat question
 

A while ago I asked if anyone had access to a pyrometer so I could borrow/rent for a tech article. Pretty much went bust.

I want to compare two or three inexpensive torches as I believe the results would benefit many DIYers here.

Here's where I need help: Does anyone have an idea on how to measure the heat generated by a torch? Perhaps between 1000 to 2500+ degrees. I'd like to get as accurate as possible and keep cost down as this will most likely be the only time I'll use such an instrument.

Ooops...really wanted to post in the Tech area...sorry for the duplicate.