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Temperature Sensor device

Hi, I'm not sure if I am re-posting this in the same place.  I was hoping to find the right group to leave this post in hopes of getting a response...so here it is again.  Thanks, Hank 

 

------I want to hook up a sensor with some "dummy lights"...green, yellow, orange, red.   We have some clients/workers who work in changing temperature environments and it would be nice to have a small sensor they could clamp on to their gear to help remind them when it's getting too hot.  We would want to monitor heat between 100F up to 750F i think.  Accuracy is not important.  e.g.  We would want to associate a green light with 100F to 200F, Yellow light with 200F+ to 300F, Orange light with 300F+ to 500F, Red light with 500F+.  We can encase/ build the device for our purposes with materials we already have.  What recommendations do you have?  Please let me know.