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Old 05-14-2011, 06:03 PM   #1
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suction cup thermometer vs. outside stick on thermometer!

which is better.
suction cup


stick on
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Old 05-14-2011, 06:05 PM   #2
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Moved to General Hardware and Equipment Discussion.

Neither is better. Whatever you like is fine. I have 1 of each between my 2 tanks I am currently running.
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Old 05-14-2011, 06:07 PM   #3
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I agree does not much matter. Which ever you like is fine.
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Old 05-14-2011, 06:08 PM   #4
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I think the in tank thermometers are better, simply because the glass can be warmer or cooler than the water if the ambient room temp is off by much.
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Old 05-14-2011, 06:17 PM   #5
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It might be off by a degree or 2, if there was an extreme difference in the temp of the tank vs. the room, but I doubt it. Water is a far better conductor of heat than air, so the glass is going to be almost the identical temperature of the water inside, not the ambient temperature of the air.
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Old 05-14-2011, 06:18 PM   #6
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The in tank thermometers are more accurate.
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Old 05-14-2011, 06:23 PM   #7
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I have one of each on my 25 and they are on opposite sides of the tank and always read the same thing. The only difference is with the in tank ones you can see the exact tally marks of the mercury but mine never changes unless I'm doing water changes.
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Old 05-14-2011, 06:26 PM   #8
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the in tank ones are harder to see the temp though that's what i was trying to see if the outside ones were still as good.
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Old 05-14-2011, 11:44 PM   #9
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I like JW's inside magnet mounted thermometer or the electronic ones with a probe inside the tank and a display outside.

I would only get the outside thermometer if you want to know the average of the tank and room at best.

Water is a great insulator of heat, not conductor of heat. It holds on to it very well.
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Old 05-14-2011, 11:59 PM   #10
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What I said is correct, and the outside thermometer is in NO way an average of the tank and room. Water is a far better conductor of heat than air. I didn't say it was a great conductor. I said it is far better than air.
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