I bought 2 digital thermometers for each end of my 125 gallon inner tank, plus a "classic" black thermometer with a health check sticker. These digital thermometers are incredibly accurate and the 24 hour recording allows me to monitor my heating throughout the night. These heaters are very easy to install. They come with batteries and are attached to the side of the tank with strong tape. I haven't tried removing the thermometers but I don't think it would be easy as they are very secure.
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