Warm but not hot

As soon as I took this out of the package, I got nervous. It’s literally like a paper thin, plastic sheet. Firstly, there is no mark on the dial so that you know it’s on. Secondly, it doesn’t seem to get very warm. I think I have it on the highest setting but who knows when you have no dial. Not sure if I can actually put it under the tank and have it be effective. It never had directions to tell me if I even used it right.

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