Over temp paint

I keep one of these on my battery (mostly out of curiosity):

IMG_4830.jpg

The highest indication I've seen is the120 deg F bar (airplane lives in Central TX).
 
The link is not paint. I use them when preheating parts to be welded and don't have my temp gun handy.

It's like a wax. It melts at a certain temp indicating you've reached whatever temperature youre looking for. Just touch it to your part
 
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