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Old 10-15-2003, 10:56 PM   #1
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Digital thermometers

Do those outside stick-ons work well?...How about for an acrylic tank?
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Old 10-15-2003, 11:07 PM   #2
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If you mean the plastic stick on ones where the liquid crystal changes color with the temp then no they are not accurate. Hard to find two that agree with each other. The glass floating ones are a bit better.

If you mean a real hang-on tank digital thermometer (electronics & probe ) then yes they are.

(I have a stickon on each tank but don't rely on them). The real digitals can come with Hi/Lo temp alarms and give room temp and time as well.
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Old 10-15-2003, 11:13 PM   #3
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I meant the stick-on. Do you know if they work equally on acrylic tanks (as opposed to glass)?
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Old 10-15-2003, 11:19 PM   #4
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they probably work better on acrylic tank, as plastic conducts heat much better than glass does.
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Old 10-15-2003, 11:25 PM   #5
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I've only used them on glass tanks, but see no reason they should not work equally poorly on acrylic tanks.
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Old 10-15-2003, 11:40 PM   #6
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the LCD technology is actually very precise (maybe not accurate, though). You will be hard-pressed to find much by way of accuracy in the thermometers you're gonna buy for an aquarium (since they aren't calibrated to a high standard of accuracy), unless you are using a mercury one...which I personally wouldn't use around fish.

My LCD works for me.
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Old 10-15-2003, 11:42 PM   #7
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My brothers college proffessor told him that the lcds are actually more accurate than the glass ones.
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Old 10-16-2003, 05:59 AM   #8
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I find that the only problem with stick on thermometers is that they will also read the room temperature as well as the tank Temperature.
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Old 10-16-2003, 10:15 AM   #9
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I have heard that the stick-ons are supposedly calibrated to take into account the conductivity of the tank, which I imagine is assumed to be glass. If that's true, then I would think there must be some difference if used on an acrylic tank if acrylic conducts differently.

Oh well, I sent an e-mail to one of the manufacturers (Hagen)...so, we'll see what they say. Im not too concerned since it's a small tank with a good quality heater...I have found that the good quality heaters have reliable thermostats, especially for small tanks where temp won't vary much.

Thanks!
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Old 10-17-2003, 02:09 PM   #10
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i would not wast your money them as they are not very good i uesed them and did not think they were very reliable get one that gos inside the tank they work much better
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Old 10-17-2003, 02:26 PM   #11
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I humbly beg to differ.

Similar items are used extensively in hospitals, the technology has been found to yield better results in a great deal of instances than digital thermometers.

I think it's important to understand that you are going to be hard-pressed to get some ulltimate exact reading on ANY aquarium thermometer. They're role should be more along the lines of monitoring CHANGE in temperature. If your heater is set at 78 and your thermometer is reading 76...it doesn't mean that either are wrong, simply that they were calibrated differently. Same goes if you were to buy 2 of the liquid crystal thermometers....if they read 2 different temperatures...it isn't because the technology is faulty, it's because the method of calibration during mass production is less than ideal.
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Old 10-17-2003, 02:28 PM   #12
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I use them and they seem to be accurate and reliable. Even if the outside temp does effect it (which mine is not affected by, on a 75) you can easily find the difference with an inside the tank therm and subtract or add the degree difference.
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