Editor's Choice - Our Favorite Floating Aquarium Thermometers

1. Marina Floating Thermometer with Suction Cup

User Ratings: 70 5

Marina 11201A1 First Impressions

"So I guess I needed them!"

This thermometer is spot on accurate. So much so that I purchased a second set of 6. Still a recommendation for me due to price and accuracy. Personally I do not mind the way it looks in my aquarium. The digital display is nice and small as well. A bit large for anything smaller than 5 gallons, but that's to be expected. This is my first 5 star review out of many many reviews on Amazon.

  • Marina Floating Thermometer with Suction Cup
  • Easy to read floating aquarium thermometer with suction cups
  • Includes a safety zone indicator appropriate for most tropical fish
  • Equipped with suction cups to attach to the side of your fish tank
  • Ensures your aquarium is at the proper temperature
  • Thermometer is 4.25 inches tall
  • Manufacture: Marina
  • Product Dimensions: 7 x 4 x 1 inches; 0.35 Ounces
  • Editor's Impressions Of The Marina 11201A1
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Marina 11201A1 Final Thoughts

"I like this."

A bit large for anything smaller than 5 gallons, but that's to be expected. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. The digital display itself is easy to read at a glance. They are within a degree or two of other thermometers I've checked to compare them. I am extremely pleased with this product. He acted aggressively towards it and so I ultimate ended up removing it due to that. This temperature read a perfect 32 degrees.

Overall Score
4.4


(8702 Points)

Peoples Choice - Other Highly Rated Floating Aquarium Thermometers

2. Marina Deluxe Floating Thermometer with Suction Cup

User Ratings: 69 7

Marina 11204 First Impressions

"THERE'S MORE!"

Was going to get a floater until I saw this magnetic one! 82 PER THERMOMETER with battery included. If the digital display starts to get dim, it's time for a new battery. And is easily hidden behind a plant. So far, they're all doing their job in my four tanks and I am quite content. I tested this in a cup crammed full of ice and some water. Sure enough the digital thermometer was way off by 6 degrees!

  • Marina Deluxe Floating Thermometer with Suction Cup
  • Easy-to-read floating thermometer
  • Includes a safety zone indicator
  • Equipped with suction cups
  • Ensures your aquarium is at a proper temperature
  • Temperature range of 30 to 120 degrees Fahrenheit
  • Manufacture: Marina
  • Product Dimensions: 0.5 x 3.8 x 4.3 inches; 0.18 Ounces
  • Editor's Impressions Of The Marina 11204
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Marina 11204 Final Thoughts

"The hotter, the faster."

I've checked it against two other thermometers that are accurate. Love it, it's easy to read and keeps an accurate temp. A bit large for anything smaller than 5 gallons, but that's to be expected. A battery can last you up to six months, I'd say, but expect more like three. I have to admit I had two reasons for buying six. However, Lucy at Zacro read this review and emailed me. A battery can last you up to six months, I'd say, but expect more like three.

Overall Score
4.4


(649 Points)

3. BOYU BT-01 Glass Thermometer for Aquarium

User Ratings: 55 20

BOYU BT-01 First Impressions

"LOVE these thermometers."

One being a very expensive digital. You can use the thermometer with or without the plastic suction cup. So far, they're all doing their job in my four tanks and I am quite content. I have to admit I had two reasons for buying six. So far I've been very thrilled with these. This doesn't bother me as it ws so cheap. However, Lucy at Zacro read this review and emailed me.

  • BOYU BT-01 Glass Thermometer for Aquarium
  • Easy-to-read floating thermometer with suction cups
  • Includes a safety zone indicator
  • Ensures your aquarium is at a proper temperature
  • Celsius or Fahrenheit options
  • Manufacture: Tin Tin Trading Inc.
  • Product Dimensions: 1 x 1 x 4.5 inches; 0.64 Ounces
  • Editor's Impressions Of The BOYU BT-01
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

BOYU BT-01 Final Thoughts

"Very easy to read."

6 in a pack, extra batteries, easy set up, great price. Ambient room temperature measures 72. If the digital display starts to get dim, it's time for a new battery. I've checked it against two other thermometers that are accurate. A bit large for anything smaller than 5 gallons, but that's to be expected. The temperature fluctuated a lot with it. One being a very expensive digital.

Overall Score
3.7


(161 Points)

4. Marina Floating Thermometer

User Ratings: 66 11

Marina 11200A1 First Impressions

"Versatile."

Have checked them against the glass thermometers and the accuracy is right on. 50 thermometers, reads much easier and no suction cup residue, also looks better. The units each had a battery in place and situated for immediate use. In this scenario it would probably get knocked loose a lot. One of my aquariums is glass, and the other two are plastic. So far, they're all doing their job in my four tanks and I am quite content. Then is started to give a low reading, and it is not reading the correct temperature.

  • Marina Floating Thermometer
  • Item Package Height: 19.812 Centimeters
  • Item Package Length: 1.778 Centimeters
  • Item Package Width: 10.922 Centimeters
  • Product Type: Pet Supplies
  • Manufacture: Marina
  • Product Dimensions: 0.4 x 3.7 x 4.2 inches; 0.64 Ounces
  • Editor's Impressions Of The Marina 11200A1
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Marina 11200A1 Final Thoughts

"Super easy."

Excellent working for our bearded dragon tank. These things are useful for a lot besides pet husbandry, too. I ordered a new one and it works GREAT! I bent it a little bit and when I put it back it was perfectly fine. I used these on a number of my aquariums that have discus fish in them. Have checked them against the glass thermometers and the accuracy is right on. So far, they're all doing their job in my four tanks and I am quite content.

Overall Score
4.2


(102 Points)

Honorable Mentions - More Top Selling Floating Aquarium Thermometers

5. Lomodo 4 Pack Floating Thermometer Aquarium Glass Temperature Gauge with Suction Cup for Fish Tank

User Ratings: 63 12

Lomodo First Impressions

"Works perfect."

I got the second one as a bonus that I'm now using in my old tank. 2 deg, if it was 32, it would be a SOLID block of ice. Bought the two pack of thermometers. Good cheap accurate aquarium thermometer. At least in the first 3 months of use. Set all six probes up in a terrarium with a constant temp of 88. I have kept aquariums for about 45 years.

  • Lomodo 4 Pack Floating Thermometer Aquarium Glass Temperature Gauge with Suction Cup for Fish Tank
  • Ideal for fish tank, aquariums, suitable for indoor and outdoor use, ensuring proper water temperature
  • The red indicator allows you to easily read the temperature
  • Green safety zone quickly indicates whether the water temperature is normal
  • Equipped with suction cups, it can either float on water or suck on glass walls
  • Easy to use: just put it in your pool, pond, fish tank, etc. and it will get you the water temperature
  • Manufacture: Lomodo
  • Editor's Impressions Of The Lomodo
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Lomodo Final Thoughts

"Very accurate."

Checked with temp gun and the terrarium was on target at 88. It will make you wonder why nobody thought of it before. The units each had a battery in place and situated for immediate use. Good cheap accurate aquarium thermometer. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. He acted aggressively towards it and so I ultimate ended up removing it due to that. This temperature read a perfect 32 degrees.

Overall Score
4.0


(61 Points)

6. Superfish Outside Garden Pond Floating Water Thermometer 0-50C

User Ratings: 75 4

Superfish 669005 First Impressions

"Perhaps it's my fault."

You can use the thermometer with or without the plastic suction cup. For the price I'll probably end up putting these in all of my aquariums. They are within a degree or two of other thermometers I've checked to compare them. I needed a solution that was not breakable and these do the trick! Only thing I don't love is how long the cord is. I'm pretty sure those reviewers have acrylic tanks. He acted aggressively towards it and so I ultimate ended up removing it due to that.

  • Superfish Outside Garden Pond Floating Water Thermometer 0-50C
  • Plastic Floating Black Pond Thermometer
  • Helps you keep an eye on your pond temperture
  • Floating with cord to attach to the side of the Pond
  • Temperature Scale 0-50 degrees Celsius (30-120F)
  • Perfect for most ponds, swimming pools and tanks
  • Manufacture: Superfish
  • Product Dimensions: 4.33 x 4.33 x 4.33 inches; 2.82 Ounces
  • Editor's Impressions Of The Superfish 669005
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Superfish 669005 Final Thoughts

"Great little thermometer."

The temperature fluctuated a lot with it. I ordered a new one and it works GREAT! Then is started to give a low reading, and it is not reading the correct temperature. 6 inch long Bala Sharks that are known to be very unruly and boisterous. These things are useful for a lot besides pet husbandry, too. It is my opinion that everyone should have these that are in the Aquarium Hobby. The non-working ones still provide 2 batteries each AND.

Overall Score
4.6


(25 Points)

7. Lomodo 9 Pack Floating Thermometer Aquarium Glass Temperature Gauge with Suction Cup for Fish Tank (...

User Ratings: 37 20

Lomodo First Impressions

"All you need."

Far more accurate than the usual small glass ones or external LCD strips. When I set up my newest tank I will be getting another one of these. This is how you calibrate a thermometer. I got root rot after light leaks and high water temps. I removed the batteries of the units I wasn't using right away. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. If the digital display starts to get dim, it's time for a new battery.

  • Lomodo 9 Pack Floating Thermometer Aquarium Glass Temperature Gauge with Suction Cup for Fish Tank (0-40℃/40-100℉)
  • You will get 9 pack floating thermometer, enough for several aquariums
  • Made of clear glass tube and PVC suction cup, good quality and durable, packaged in blister, providing from breaking during transportation
  • Red indicator line let you read the temperature quickly and easily, temperature ranges from 0-40℃/40-100℉
  • Come with suction cup, which can suck the aquariums wall tightly
  • Widely application: you can put it in your pool, pond, fish tank, aquariums, etc
  • Manufacture: Lomodo
  • Product Dimensions: 6.5 x 2.76 x 1.02 inches; 5.93 Ounces
  • Editor's Impressions Of The Lomodo
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Lomodo Final Thoughts

"Sticks easy."

I was using one of those ubiquitous cheap digital thermometers on Amazon. The suction cups work well anywhere I have placed it it has not Fallen. The units each had a battery in place and situated for immediate use. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. I recommend gluing the suction cups in place where needed for long-term installation. And for the price you cant beat it. I tested this in a cup crammed full of ice and some water.

Overall Score
3.5


(15 Points)

8. MECO(TM) Aquarium Fish Tank Suction Glass Temperature Thermometer

User Ratings: 66

GOZIER First Impressions

"Suction cups fail."

I am extremely pleased with this product. I have bought many many temperature gauges for my various fish tanks over the years. I was using one of those ubiquitous cheap digital thermometers on Amazon. 6F all six took about three minutes to read between 88. Simple fix, you adjust the thermometer within the suction cup and VIOLA! When and if we run out of this batch, I'll instantly order another batch. I had my heater set at 73-degrees and the thermometers showed 74.

  • MECO(TM) Aquarium Fish Tank Suction Glass Temperature Thermometer
  • Is a long version that easily attaches to your tank with the suction cap provided.
  • Just drop it in the tank and attached the suction cup to the inside of the tank for easy and accurate reading.
  • Clear and easy to read scale. Clear tells you what the temperature is in both Celsius and Fahrenheit degrees.
  • Permanently sealed glass of the floating thermometer with suction cup for your fish tank and aquarium is easy to clean.
  • Being that this thermometer is inside the tank, it gives a much accurate reading of the water temperature than those placed on the outside.
  • Editor's Impressions Of The GOZIER
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

GOZIER Final Thoughts

"2 deg of 32."

I'm pretty sure those reviewers have acrylic tanks. I recommend gluing the suction cups in place where needed for long-term installation. Have checked them against the glass thermometers and the accuracy is right on. I removed the batteries of the units I wasn't using right away. These digital thermometers are great and there is no guesswork involved. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. It worked great and I highly recommend it!

Overall Score
4.7


(4 Points)

9. Lomodo 16 Pack Floating Thermometer Aquarium Glass Temperature Gauge with Suction Cup for Fish Tank ...

User Ratings: 42 15

Lomodo First Impressions

"Works well!"

All were Close enough for a fish tank and other uses. I used these on a number of my aquariums that have discus fish in them. I don't think i'll ever be able to trust a digital thermometer again. SIX Digital Thermometers with SIX batteries INCLUDED working so well. I tested this in a cup crammed full of ice and some water. The display can be set to Fahrenheit or Celsius. I am extremely pleased with this product.

  • Lomodo 16 Pack Floating Thermometer Aquarium Glass Temperature Gauge with Suction Cup for Fish Tank (0-40℃/40-100℉)
  • You will get large quantities of 16 pack floating thermometer, enough for several aquariums
  • Made of clear glass tube and PVC suction cup, good quality and durable, packaged in blister, providing from breaking during transportation
  • Red indicator line let you read the temperature quickly and easily, temperature ranges from 0-40℃/40-100℉
  • Come with suction cup, which can suck the aquariums wall tightly
  • Widely application: you can put it in your pool, pond, fish tank, aquariums, etc
  • Manufacture: Lomodo
  • Product Dimensions: 6.3 x 2.56 x 1.02 inches; 10.62 Ounces
  • Editor's Impressions Of The Lomodo
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Lomodo Final Thoughts

"So far loving it."

Personally I do not mind the way it looks in my aquarium. Simple fix, you adjust the thermometer within the suction cup and VIOLA! 89 I could buy Six Thermometers with Six included batteries. Personally I do not mind the way it looks in my aquarium. The plastic from the suction cup quickly turned from a clear to a milky white. So far, they're all doing their job in my four tanks and I am quite content. You can use the thermometer with or without the plastic suction cup.

Overall Score
3.6


(3 Points)

10. Natural Color Glass Thermometer for Aquariums, Aquarium Floating Glass Thermometer with Suction for ...

AquariumH2o First Impressions

"Not just for aquariums!"

It is always where yo last put it and it is very easy to see and read. These things are useful for a lot besides pet husbandry, too. We are using them to measure various temperatures inside and outside of a motorhome. I needed a solution that was not breakable and these do the trick! I used these to raise chicks, and in my parrot cages. My 50+ eyes cannot read a regular tank thermometer without squinting. The digital display is nice and small as well.

  • Natural Color Glass Thermometer for Aquariums, Aquarium Floating Glass Thermometer with Suction for Fresh or Marine Fish Tank
  • Sealed glass, easy to clean
  • Up to 122 Fahrenheit 50 Celsius
  • Natural Color Glass Thermometer For Aquariums, Aquarium Floating Glass Thermometer with Suction for Fresh or Marine Fish Tank
  • This thermometer attaches easily to both plastic and glass walls, and features numbers that are easy to read and accurate readings.
  • Manufacture: United Aquatics, LLC.
  • Editor's Impressions Of The AquariumH2o
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

AquariumH2o Final Thoughts

"Suction cups are okay."

This temperature read a perfect 32 degrees. As you can see from my photos, in both°F and°C, all six are within. The lid is textured aluminum, and the suction cups don't stick to that. You can use the thermometer with or without the plastic suction cup. I recommend gluing the suction cups in place where needed for long-term installation. This is my first 5 star review out of many many reviews on Amazon. Since it is a mercury thermometer, it is very accurate.

Overall Score
4.0


(1 Points)

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