Homebrew PCBs

Like this?

http://www.tmchallcrest.com/

Kerry

Jim Barnes wrote:
> Hi,
>
>  
>
> Long ago (20-plus years), when I worked in aerospace, we had little
> paper strips that we attached inside a unit to find out how hot it got
> during test. As I recall, they had dots which permanently changed color
> at different temperatures. Google couldn't find them but maybe I didn't
> ask it the right question. Has anyone else heard of these? Are they
> still made? It seems they would be perfect for measuring roller
> temperature. 
>
>  
>
> Jim
>
>