I’ve always used the kind that attach to the side of the tank with a suction cup. I can never get them to remain attached for any length of time, no matter how well I clean the glass and suction cup. I’m looking for a better idea.
Just keep buying them till you get one with a good sucker. Or buy some suckers and try them.
Or, surface tension will keep it stuck to the glass if the flow in the tank isn’t too strong (you may have to turn it to read it).
I did some poking around on Amazon and found a thermometer that attaches to the glass by means of a magnet on the outside of the tank. Seems like a better idea than the suction cup. I think I’ll be ordering one of those.
I use a digital thermometer, you can set it to °C or °F, it sits on the outside of the tank with a thin wire hanging into the water, just wrap it around your pipping. Had it years and its literally maybe a few degrees more from what my external heaters state. They are very good and accurate.
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