Editor's Choice - Our Favorite Juwel Aquarium Thermometers

1. Juwel Digital Aquarium Thermometer

User Ratings: 59 12

Juwel JU85702NET First Impressions

"Would buy again."

I find that the temps are accurate, and this product gives added peace of mind. Still a recommendation for me due to price and accuracy. Works well in my betta tank, but provide a couple hours for it to read temp changes. Simple fix, you adjust the thermometer within the suction cup and VIOLA! I needed a solution that was not breakable and these do the trick! I tested this in a cup crammed full of ice and some water. Ambient room temperature measures 72.

  • Juwel Digital Aquarium Thermometer
  • Wipe clean
  • The Juwel Digital Thermometer 2.0 has a large, easy-to-read digital display so you can easily keep an eye on the temperature in your aquarium.
  • Batteries included.
  • Manufacture: Juwel
  • Product Dimensions: 0.39 x 0.39 x 0.39 inches; 1.34 Ounces
  • Batteries: 1 LR44 batteries required. (included)
  • Editor's Impressions Of The Juwel JU85702NET
  • Thermometer Accuracy [star rating='3.1']
  • Quality [star rating='4']
  • Value For Money [star rating='4.6']
  • Affordability [star rating='4.6']

Juwel JU85702NET Final Thoughts

"This is perfect."

I got the second one as a bonus that I'm now using in my old tank. 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. So much so that I purchased a second set of 6. Far more accurate than the usual small glass ones or external LCD strips. All are pretty accurate within one degree as claimed. Personally I do not mind the way it looks in my aquarium.

Overall Score
4.0

[star rating="4"]
(1017 Points)

2. Shyfish LCD Digital Aquarium Thermometer,Fish Tank Water Terrarium Temperature for Fish and Reptiles...

Shyfish First Impressions

"So we are ordering more."

I was using one of those ubiquitous cheap digital thermometers on Amazon. I have this thermometer on all my tanks. A bit large for anything smaller than 5 gallons, but that's to be expected. These are the perfect size to be easily read while not being obtrusive. Far more accurate than the usual small glass ones or external LCD strips. Still a recommendation for me due to price and accuracy. It worked great and I highly recommend it!

  • Shyfish LCD Digital Aquarium Thermometer,Fish Tank Water Terrarium Temperature for Fish and Reptiles,Room Temperature,Indoor Humidity 3 in1(Fahrenheit)
  • Show clearly temperature: Pure transparent screen, You can read the temperature data clearly in the LCD screen. You can choose seither Fahrenheit or Celsius according to your need
  • Accurate measurement:The high-precision temperature probe can be immersed in the water for a long time to truly measure the temperature of the fish tank,Please note that taking into account the indoor temperature and humidity measurement the thermometer reading has about 0.3 degree deviation
  • Multifunctional measurement:Fish tank water temperature, room temperature, indoor humidity, three in one
  • Alarm function: Independently set high and low temperature thresholds, and automatically alarm when the threshold is exceeded.
  • Easy to use: Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water)
  • Manufacture: Shyfish
  • Product Dimensions: 4.96 x 2.95 x 0.35 inches; 3.53 Ounces
  • Batteries: 1 CR2 batteries required. (included)
  • Editor's Impressions Of The Shyfish
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='4']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

Shyfish Final Thoughts

"2 degrees of each other."

It is always where yo last put it and it is very easy to see and read. I have bought many many temperature gauges for my various fish tanks over the years. I bought these for my dwc reservoirs. I've checked it against two other thermometers that are accurate. The suction cups work well anywhere I have placed it it has not Fallen. Simple fix, you adjust the thermometer within the suction cup and VIOLA! My 50+ eyes cannot read a regular tank thermometer without squinting.

Overall Score
5.0

[star rating="5"]
(1 Points)

3. SunGrow LCD Digital Betta Thermometer, Accurately Reads Tank Water Temperature, Maintains Betta's Re...

User Ratings: 68 3

SunGrow First Impressions

"Love it for my turtles."

This is how you calibrate a thermometer. Very accurate, have checked it with other thermometers as well. You can not swivle the thermometer to face a certain way. I had my heater set at 73-degrees and the thermometers showed 74. I came here to give this product a positive review. They reviewed the packaging or shipping by saying it arrived broken. It will make you wonder why nobody thought of it before.

  • SunGrow LCD Digital Betta Thermometer, Accurately Reads Tank Water Temperature, Maintains Betta's Real Habitat, Easy to Install, Comes with 2 Suction Cups and Battery
  • MAINTAINS TROPICAL HABITAT FOR BETTA--- In nature, betta fish are often found in warm and hot waters in low altitude areas such as Burma and Thailand. For the healthiest and most active betta, it is important to make their environment as close as possible to their habitat. Since betta are accustomed to consistent tropical temperatures, having an effective betta thermometer is essential to ensure the perfect temperature for your pet fish.
  • ACCURATELY MONITORS BETTA TANK WATER TERRARIUM TEMPERATURE --- When it comes to monitoring the water temperature of your betta tank, the most useful tool you can find is an aquarium thermometer. Don’t let your betta tell you it’s too cold or hot in the tank for them, by getting ill, and risk losing them. The durable, reliable Digital Thermometer from SunGrow quickly tells you the temperature at a quick glance any time, so that you can make potentially life saving adjustments to your betta tank
  • SHOWS TEMPERATURE IN FAHRENHEIT OR CELSIUS --- SunGrow Digital Thermometer displays the temperature in both Fahrenheit and Celsius and has a measurement of -58° to +158°F. If the water temperature is outside of that range, the screen will display L° for low temps and H° for high temps. To check the temperature, submerge the 38” cable and reading tip into the water and attach it using the suction cup. Then using another suction cup, place the LCD thermometer in a place most convenient for you
  • HELPS PROTECT BETTA FUR COAT SYNDROME --- As they are so sensitive to water temperature changes, betta are particularly susceptible to issues like Fur Coat Syndrome. It is a dermal infection that discolors betta’s fins and covers your fish in a furry mold. Fur Coat Syndrome is nearly always fatal within 30hrs of symptoms showing and is highly contagious. However, this is easily prevented if you keep your betta’s water between 78° and 80° Fahrenheit.
  • ENSURE HAPPINESS & LONGEVITY OF BETTA --- Being able to quickly and accurately read your betta tank’s water temperature is essential to keeping your betta fish healthy. Changes in water temperature can greatly stress out betta fish and seriously harm them. By using SungGrow Digital Thermometer,you ensure the happiness and longevity of your betta.
  • Manufacture: Luffy Pets Collection
  • Editor's Impressions Of The SunGrow
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='5']
  • Value For Money [star rating='3.4']
  • Affordability [star rating='4.7']

SunGrow Final Thoughts

"Suction cups fail."

I used these to raise chicks, and in my parrot cages. My 50+ eyes cannot read a regular tank thermometer without squinting. And for the price you cant beat it. One being a very expensive digital. So this is the extreme end of the high temperature range. I read some of the 1 star reviews and most of them are not about the product. I have mine on my 60 gallon cube marine tank.

Overall Score
4.4

[star rating="4.4"]
(159 Points)

4. 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 [star rating='4.2']
  • Quality [star rating='3.5']
  • Value For Money [star rating='3']
  • Affordability [star rating='3.5']

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

[star rating="4"]
(1 Points)

5. SunGrow Neon Tetra Thermometer with LCD Display, Accurately Reads Tank Water Temperature, Battery an...

User Ratings: 78 1

SunGrow First Impressions

"I opened the first three."

I am extremely pleased with this product. I am extremely pleased with this product. I recommend gluing the suction cups in place where needed for long-term installation. The display can be set to Fahrenheit or Celsius. 6F all six took about three minutes to read between 88. The digital display itself is easy to read at a glance. The suction cups work well anywhere I have placed it it has not Fallen.

  • SunGrow Neon Tetra Thermometer with LCD Display, Accurately Reads Tank Water Temperature, Battery and 2 Suction Cups Included for Quick Installation
  • MAINTAINS NATIVE TROPICAL HABITAT FOR YOUR FRESHWATER FISH --- In nature, tetras are often found in warm and clearwater streams in Amazon basin of South America. For the healthiest and most active Neon Tetra, it is important to replicate their habitat as close as possible. Since neon tetras are accustomed to consistent tropical temperatures, having an effective thermometer for them is essential.
  • ACCURATELY MONITORS TANK WATER TEMPERATURE --- When it comes to monitoring the water temperature of your freshwater fish tank, the most useful tool you can find is an aquarium thermometer. Don’t let your pet tell you it’s too cold or hot in the tank for them, by getting ill, and risk losing them. The Digital Thermometer from SunGrow quickly tells you the temperature at a quick glance any time, so that you can make adjustments before the situation gets out of control.
  • SHOWS TEMPERATURE IN FAHRENHEIT OR CELSIUS --- SunGrow Digital Thermometer displays the temperature in both Fahrenheit and Celsius and has a measurement of -58° to +158°F. If the water temperature is outside of that range, the screen will display L° for low temps and H° for high temps. To check the temperature, submerge the 38” cable and reading tip into the water and attach it using the suction cup. Then using another suction cup, place the LCD thermometer in a place most convenient for you.
  • HELPS PROTECT TETRA FROM FUR COAT SYNDROME --- As they are so sensitive to water temperature changes, they are susceptible to Fur Coat Syndrome. However, corrective action can be taken if you keep your fish’s tank water between 78° and 80° Fahrenheit.
  • ENSURE HAPPINESS & LONGEVITY OF TETRA --- Being able to quickly and accurately read your fish tank’s water temperature is essential to keeping your pet healthy. Changes in water temperature can greatly stress them and affect their immune system. By using SungGrow Digital Thermometer, you ensure their happiness and long life.
  • Manufacture: Luffy Pets Collection
  • Editor's Impressions Of The SunGrow
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='4']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.2']

SunGrow Final Thoughts

"Or left a mark."

I have mine on my 60 gallon cube marine tank. The plastic from the suction cup quickly turned from a clear to a milky white. Set all six probes up in a terrarium with a constant temp of 88. I guess these units do not like saltwater. I got root rot after light leaks and high water temps. I got the second one as a bonus that I'm now using in my old tank. I use a small flashlight if I don't want to brighten the area.

Overall Score
4.6

[star rating="4.6"]
(309 Points)

6. VIVOSUN 2-Pack LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature with Suction C...

User Ratings: 71 3

VIVOSUN First Impressions

"Fast accurate readings."

Excellent working for our bearded dragon tank. It is my opinion that everyone should have these that are in the Aquarium Hobby. I ordered a new one and it works GREAT! The non-working ones still provide 2 batteries each AND. Water tested with Autidefy brand for two hours. The lid is textured aluminum, and the suction cups don't stick to that. This doesn't bother me as it ws so cheap.

  • VIVOSUN 2-Pack LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature with Suction Cup for Turtle
  • HIGH ACCURACY: Temperature Range: -50℃ ~ +70℃ (-58 °F ~ +158 °F); This aquarium thermometer is accurate to +/- 1℃, no matter whether the probe is placed in any corner of this fish tank, an accurate temperature will be displayed
  • LCD DISPLAY: Comes with a large LCD display that is easy to read clearly and accurately
  • ADJUSTABLE UNIT TEMPERATURE: Easy to adjust the temp between Fahrenheit and Celsius displays; Long-press the power button to adjust the unit display
  • TWO SUCTION CUPS: Equipped with two suction cups, one for attaching the cable to the side of the tank and another for attaching the thermometer
  • SUPER LONG CABLE: The cable length connected to the probe is 39.37 inch (1 m) superior to 23.62 inch (60 cm) standard cable length; Allows accurate temperature measurements in even the largest fish tanks
  • 1. Open the battery cover on the back of this thermometer and insert the button battery to ensure the “+” positive electrode is face up;
  • 2. Use one suction cup to attach the back of this thermometer, then fix this unit to the outer of this fish tank, another suction cup is for attaching the cable;
  • 3. Submerge the probe attached cable into the fish tank;
  • Manufacture: VIVOSUN
  • Editor's Impressions Of The VIVOSUN
  • Thermometer Accuracy [star rating='3.6']
  • Quality [star rating='5']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.2']

VIVOSUN Final Thoughts

"There is no question."

Love it, it's easy to read and keeps an accurate temp. And I just really started to doubt it. 6 inch long Bala Sharks that are known to be very unruly and boisterous. Then is started to give a low reading, and it is not reading the correct temperature. Far more accurate than the usual small glass ones or external LCD strips. It's kind of difficult to hide and keep out of the way. I came here to give this product a positive review.

Overall Score
4.5

[star rating="4.5"]
(512 Points)

7. Smarttemp Thermometer

User Ratings: 68

SMARTTEMP THERMOMETER First Impressions

"Fish and me happy."

It is large enough to see without being obtrusive. I've checked it against two other thermometers that are accurate. I got the second one as a bonus that I'm now using in my old tank. Place it on your aquarium and you are good to go. He acted aggressively towards it and so I ultimate ended up removing it due to that. It is large enough to see without being obtrusive. 6 inch long Bala Sharks that are known to be very unruly and boisterous.

  • Smarttemp Thermometer
  • SMARTTEMP THERMOMETER, 2 PACK, AQUARIUM, THERMOMETER & HYDROMETER, JW PET COMPANY
  • SMARTTEMP THERMOMETER
  • AQUARIUM
  • Saltwater safe.
  • Pack of 2
  • Manufacture: JW - AQUATIC
  • Product Dimensions: 3 x 3 x 3 inches; 3.2 Ounces
  • Editor's Impressions Of The SMARTTEMP THERMOMETER
  • Thermometer Accuracy [star rating='4.7']
  • Quality [star rating='3.8']
  • Value For Money [star rating='4.8']
  • Affordability [star rating='3.6']

SMARTTEMP THERMOMETER Final Thoughts

"Or left a mark."

Still a recommendation for me due to price and accuracy. The lid is textured aluminum, and the suction cups don't stick to that. Now if it falls into a sink full of water, it's not a problem. It's kind of difficult to hide and keep out of the way. Water tested with Autidefy brand for two hours. I used these on a number of my aquariums that have discus fish in them. They are within a degree or two of other thermometers I've checked to compare them.

Overall Score
4.5

[star rating="4.5"]
(10 Points)

8. Marina ThermoSensor In-Out Thermometer

User Ratings: 47 15

Marina 11196 First Impressions

"1 degree of each other."

Have checked them against the glass thermometers and the accuracy is right on. The non-working ones still provide 2 batteries each AND. I guess these units do not like saltwater. I have mine on my 60 gallon cube marine tank. It is about 6 inches in length and roughly an inch wide. This is my first 5 star review out of many many reviews on Amazon. You can use the thermometer with or without the plastic suction cup.

  • Marina ThermoSensor In-Out Thermometer
  • Provides both inside and outside aquarium temperature readings
  • Accurate, easy-to-read digital display
  • Can be attached anywhere on the aquarium
  • Velcro mount for easy installation; Battery included
  • Contains temperature probe
  • Manufacture: Marina
  • Product Dimensions: 0.75 x 3 x 1.5 inches; 1.44 Ounces
  • Batteries: 2 LR44 batteries required. (included)
  • Editor's Impressions Of The Marina 11196
  • Thermometer Accuracy [star rating='3.8']
  • Quality [star rating='2.9']
  • Value For Money [star rating='3.4']
  • Affordability [star rating='4.6']

Marina 11196 Final Thoughts

"Close enough I reckon!"

So far, they're all doing their job in my four tanks and I am quite content. I removed the batteries of the units I wasn't using right away. So, in those cases, I find it easier to simply replace it. You can not swivle the thermometer to face a certain way. The temperature fluctuated a lot with it. I came here to give this product a positive review. I use a small flashlight if I don't want to brighten the area.

Overall Score
3.7

[star rating="3.7"]
(66 Points)

9. UEETEK Aquarium Thermometer Fish Tank Thermometer LCD Digital with Suction Cup for Pond Marine (Blac...

User Ratings: 17 19

UEETEK First Impressions

"It works great."

SIX Digital Thermometers with SIX batteries INCLUDED working so well. So far, they're all doing their job in my four tanks and I am quite content. He was moving slow in the winter and we realized he needed a heater! Now that the chickens are grown, I have one out in the coop as well. My only complaint is that they tend to be a one time use. Since adding one of these, it has been much easier to monitor the temp of my tanks. Was going to get a floater until I saw this magnetic one!

  • UEETEK Aquarium Thermometer Fish Tank Thermometer LCD Digital with Suction Cup for Pond Marine (Black) - 2 Pieces
  • Digital LCD Thermometer for Aquarium Fish Tank Vivarium Reptile Terrarium
  • Ideal for Aquarium or terrarium temperature monitoring.
  • Aquarium Thermometer, Digital Water Thermometer For Fish Tank Aquarium Marine Temperature.
  • -Attach the display unit to the outside of the tank using the suction cups and submerge the probe into the water in the tank.
  • The thermometer is accurate enough to create readings within 0.1 degree
  • Manufacture: UEETEK
  • Product Dimensions: 2.28 x 1.42 x 0.47 inches; 1.76 Ounces
  • Editor's Impressions Of The UEETEK
  • Thermometer Accuracy [star rating='3.4']
  • Quality [star rating='2.6']
  • Value For Money [star rating='3.9']
  • Affordability [star rating='3.3']

UEETEK Final Thoughts

"Works perfect."

I ordered this guy and it was 6 degrees hotter than the digital! I think the people who said the suction cup broke. So far, they're all doing their job in my four tanks and I am quite content. Simple fix, you adjust the thermometer within the suction cup and VIOLA! Still a recommendation for me due to price and accuracy. The temperature fluctuated a lot with it. It is large enough to see without being obtrusive.

Overall Score
3.2

[star rating="3.2"]
(6 Points)

10. KollerCraft TOM Temp Alert Digital Thermometer for Aquariums

User Ratings: 39 13

KollerCraft TM1208 First Impressions

"A solid five stars."

The only reason I didn't give this 5 stars is because my betta fish didn't like it. I'm pretty sure those reviewers have acrylic tanks. And for the price you cant beat it. I did have a problem with one in my first pack of 6. Was going to get a floater until I saw this magnetic one! Checked with temp gun and the terrarium was on target at 88. The non-working ones still provide 2 batteries each AND.

  • KollerCraft TOM Temp Alert Digital Thermometer for Aquariums
  • Digital thermometer for aquariums reliably monitors high and low temperatures
  • Audible and LED notifications when temperatures fall below or rise above presets
  • Presets for a low of 75 degrees F and a high of 82 degrees F
  • For use in both freshwater and saltwater aquariums
  • Plastic probe with suction cup, 3-foot cord
  • Warning when the temperature goes outside the preset range
  • Display is easy to read
  • Temperature reading is very accurate
  • Manufacture: Koller Enterprises
  • Product Dimensions: 7.5 x 5 x 1.5 inches; 1.6 Ounces
  • Editor's Impressions Of The KollerCraft TM1208
  • Thermometer Accuracy [star rating='3']
  • Quality [star rating='4.1']
  • Value For Money [star rating='4.6']
  • Affordability [star rating='4.6']

KollerCraft TM1208 Final Thoughts

"Never had any problems."

Very impressed, I have now had them in used for a month so far. This is my first 5 star review out of many many reviews on Amazon. Works well in my betta tank, but provide a couple hours for it to read temp changes. I have this thermometer on all my tanks. 82 PER THERMOMETER with battery included. I tested this in a cup crammed full of ice and some water. I had my heater set at 73-degrees and the thermometers showed 74.

Overall Score
3.7

[star rating="3.7"]
(52 Points)

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