Another novice question....
I removed an UTH a while back and just have had it in the supply bin. How can I tell if it is any good? It is a ZooMed and was stuck to the bottom of a glass aqu. I have a new one, but if this week old one that I pulled off is still good then I would like to use it. I was pretty careful not to bend it too much when pulling it off, but I do not know what risk I am taking if I did.
Is it a fire hazard or will it just not heat up if I broke the filiment or whatever is on the inside of this thing?