Editor's Choice - Our Favorite JW Pet Aquarium Thermometers

1. JW Pet Company Smarttemp Thermometer Aquarium Accessory

User Ratings: 72 6

JW Pet 21600 First Impressions

"Working wonderfully!"

These digital thermometers are great and there is no guesswork involved. So the extra units will always come in handy. Since it is a mercury thermometer, it is very accurate. I did have a problem with one in my first pack of 6. I have mine on my 60 gallon cube marine tank. Only thing I don't love is how long the cord is. When and if we run out of this batch, I'll instantly order another batch.

  • JW Pet Company Smarttemp Thermometer Aquarium Accessory
  • In-tank thermometer is secured with magnet outside the tank
  • No suction cups needed
  • Green safe zone indicates optimal temperature range
  • Large easy to read numbers
  • Manufacture: JW Pet Company
  • Product Dimensions: 4 x 7 x 0.5 inches; 1.12 Ounces
  • Editor's Impressions Of The JW Pet 21600
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

JW Pet 21600 Final Thoughts

"I like this."

I used these on a number of my aquariums that have discus fish in them. It works equally well on all of them. Very impressed, I have now had them in used for a month so far. So far, they're all doing their job in my four tanks and I am quite content. So this is the extreme end of the high temperature range. I have to admit I had two reasons for buying six. The extra batteries where very much appreciated and came in handy.

Overall Score
4.5


(1488 Points)

Peoples Choice - Other Highly Rated JW Pet Aquarium Thermometers

2. Smarttemp Thermometer

User Ratings: 75 10

JW Pet BC209450 First Impressions

"Close enough I reckon!"

You can use the thermometer with or without the plastic suction cup. I ordered a new one and it works GREAT! Ordered three of these and they do the job. 82 PER THERMOMETER with battery included. I ordered this guy and it was 6 degrees hotter than the digital! The only reason I didn't give this 5 stars is because my betta fish didn't like it. These things are useful for a lot besides pet husbandry, too.

  • Smarttemp Thermometer
  • Stays in place with a unique magnetic fastening system.
  • Smarttemp Thermometer
  • All items are brand new, never worn and never used. We guarantee the authenticity of all items.
  • Manufacture: JW - Dog/Cat/Aquatic
  • Product Dimensions: 7 x 4 x 0.6 inches; 0.8 Ounces
  • Editor's Impressions Of The JW Pet BC209450
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

JW Pet BC209450 Final Thoughts

"Only thing the battries."

Since it is a mercury thermometer, it is very accurate. It is about 6 inches in length and roughly an inch wide. It is large enough to see without being obtrusive. It works equally well on all of them. Far more accurate than the usual small glass ones or external LCD strips. Now if it falls into a sink full of water, it's not a problem. Ordered three of these and they do the job.

Overall Score
4.4


(63 Points)

3. POPETPOP Pet Dog Thermometer Digital - LCD Waterproof Electronic Portable Vetinary Thermometer for D...

User Ratings: 29 22

POPETPOP J17LR51I0OV0P449AW15T0F First Impressions

"I like the product."

Ordered three of these and they do the job. Set all six probes up in a terrarium with a constant temp of 88. At least in the first 3 months of use. My poor fish was in 86 degrees water for a month. If the digital display starts to get dim, it's time for a new battery. They are within a degree or two of other thermometers I've checked to compare them. Since it is a mercury thermometer, it is very accurate.

  • POPETPOP Pet Dog Thermometer Digital - LCD Waterproof Electronic Portable Vetinary Thermometer for Dog Puppy Cats Rabbits Kittens Sheep Celsius Only
  • Animal Thermometer Waterproof rubber probe, flexible, soft tactility more comfortabe.
  • Soft sensor, measurement accuracy, LCD display and waterproof.
  • Suitable for your farm animal, pigs, cattle, sheep, etc.
  • Directions for use: Insert the thermometer soft head position rectal 5-8 cm, press the switch (ON/OFF) button, hear di after start measuring, when they hear continuous di... After the measurement end. 20-40 seconds out thermometer, view the measurement results, according to the switch key to clos
  • Cat temperature thermometer made of high quality ABS material, practical, durable and safe.
  • Manufacture: POPETPOP
  • Product Dimensions: 4.72 x 1.18 x 0.79 inches; 0.71 Ounces
  • Editor's Impressions Of The POPETPOP J17LR51I0OV0P449AW15T0F
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

POPETPOP J17LR51I0OV0P449AW15T0F Final Thoughts

"And he is a betta."

Simple fix, you adjust the thermometer within the suction cup and VIOLA! Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. When I set up my newest tank I will be getting another one of these. Works well in my betta tank, but provide a couple hours for it to read temp changes. So much easier than the ones that hang on the inside. I had my heater set at 73-degrees and the thermometers showed 74. The digital display itself is easy to read at a glance.

Overall Score
3.2


(32 Points)

4. 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
  • Quality
  • Value For Money
  • Affordability

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


(159 Points)

5. Dr. Marine Glass Saltwater Hydrometer Thermometer Reef Soft Coral

User Ratings: 65 9

Aquarium Equip SU First Impressions

"6 tenths of a degree."

These are the perfect size to be easily read while not being obtrusive. You can not swivle the thermometer to face a certain way. The non-working ones still provide 2 batteries each AND. I am extremely pleased with this product. I have mine on my 60 gallon cube marine tank. These are the perfect size to be easily read while not being obtrusive. You can not swivle the thermometer to face a certain way.

  • Dr. Marine Glass Saltwater Hydrometer Thermometer Reef Soft Coral
  • Ensures proper gravity of aquarium water. Easy to use.
  • Ensures all water has the same salinity within aquarium
  • Green indicators are ideal range of water temperature and specific gravity for most salt water / marine aquariums.
  • Measure both Temperature and Specific Gravity of the water.
  • SIZE:19.2CM(7.5"). Glass Hydrometer; Measures Celsius and Fahrenheit
  • Manufacture: SU
  • Product Dimensions: 8.1 x 0.8 x 0.8 inches; 0.96 Ounces
  • Editor's Impressions Of The Aquarium Equip SU
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Aquarium Equip SU Final Thoughts

"Great product!"

A battery can last you up to six months, I'd say, but expect more like three. You can use the thermometer with or without the plastic suction cup. So the extra units will always come in handy. So far I've been very thrilled with these. 6F all six took about three minutes to read between 88. Works well in my betta tank, but provide a couple hours for it to read temp changes. So far, they're all doing their job in my four tanks and I am quite content.

Overall Score
4.2


(100 Points)

6. POPETPOP LCD Digital Aquarium Thermometer High Precision Digital Fish Tank Thermometer for Aquarium/...

User Ratings: 60 7

POPETPOP First Impressions

"I am new to the hobby."

Very impressed, I have now had them in used for a month so far. Now if it falls into a sink full of water, it's not a problem. I use a small flashlight if I don't want to brighten the area. So much so that I purchased a second set of 6. This little wonder allows me to see at a glance that everything is as it should be. I find that the temps are accurate, and this product gives added peace of mind. In the right situation this magnet thermometer is the best available.

  • POPETPOP LCD Digital Aquarium Thermometer High Precision Digital Fish Tank Thermometer for Aquarium/Pond/Reptile Turtles Habitats (Blue)
  • TEMPERATURE - Temperature range is -20℃ ~ + 70℃. Temperature accuracy is ±1℃(±2℉). Update measured temperature every 10 seconds.
  • READINGS - LCD screen displays measured temperature which can be switched between ℃ and ℉, and it can save the maximum and minimum readings during past tests.
  • SCREEN - Large screen displays clearly, no dead corner on the left or right make it looks more beautiful. Besides, if you want a clearer screen displays, you can remove the screen protector.
  • INSTALLATION - Easy and convenient to install at fish tank with suction cup or spring clip that make sure space-saving and portable. You can put this small thermometer at anyplace you want to place. (Please only submerge probe, don't submerge thermometer in water)
  • MATERIAL - Eco-friendly ABS shell which is tough and hard. Excellent mechanical properties make the device safer, wear-resistant and stable. High accuracy with professional sensor, it can measure temperature more correctly than same product. Powered by two AG13 button cells (included).
  • Manufacture: POPETPOP
  • Product Dimensions: 2.76 x 2.76 x 1.18 inches; 1.8 Ounces
  • Editor's Impressions Of The POPETPOP
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

POPETPOP Final Thoughts

"Subtracted from the tank."

Simple fix, you adjust the thermometer within the suction cup and VIOLA! He acted aggressively towards it and so I ultimate ended up removing it due to that. I use a small flashlight if I don't want to brighten the area. I use a small flashlight if I don't want to brighten the area. Now if it falls into a sink full of water, it's not a problem. He was moving slow in the winter and we realized he needed a heater! Works well in my betta tank, but provide a couple hours for it to read temp changes.

Overall Score
4.2


(105 Points)

7. Genuine Pavia Rectal Temp Veterinary Thermometer for Dogs, Cats, Horses, Pets and Livestock. Accurat...

Pavia Rectal Temp Veterinary Thermometer First Impressions

"89 plus free shipping."

Now if it falls into a sink full of water, it's not a problem. One of my aquariums is glass, and the other two are plastic. These digital thermometers are great and there is no guesswork involved. The non-working ones still provide 2 batteries each AND. The units each had a battery in place and situated for immediate use. As you can see from my photos, in both°F and°C, all six are within. For the price I'll probably end up putting these in all of my aquariums.

  • Genuine Pavia Rectal Temp Veterinary Thermometer for Dogs, Cats, Horses, Pets and Livestock. Accurate Temps in Only 6 Seconds. Beeps When Ready. Trusted by Veterinarians, Breeders and Pet Owners.
  • PAVIA VETERINARY THERMOMETER: Fast, accurate rectal temps in as quick as 6 seconds. Used in veterinary clinics the world over, now available direct to kennels, rescues, shelters, breeders and pet owners everywhere.
  • FAST AND ACCURATE: Stable, accurate temperature readings in as quick as 6 seconds. Accurate to within +/- 0.2°F. Beeps when ready.
  • VERSATILE &ERGONOMIC: The small-diameter, 3-inch-long probe enables temperature taking of any size animal. Designed for easy holding and operation. Large, easy-view, 4-digit LCD.
  • RUGGED & DEPENDABLE: Tough, smooth exterior disinfects easily with soap or alcohol. Probe covers are not required. Ready to use at the press of a button.
  • IN THE BOX: Pavia Rectal TEMP Veterinary Thermometer, two (2) AAA batteries, Instructions. 90-day warranty.
  • Manufacture: Pavia Sales Group
  • Editor's Impressions Of The Pavia Rectal Temp Veterinary Thermometer
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Pavia Rectal Temp Veterinary Thermometer Final Thoughts

"It is within."

I bought these for my dwc reservoirs. The units each had a battery in place and situated for immediate use. However, Lucy at Zacro read this review and emailed me. 82 PER THERMOMETER with battery included. My poor fish was in 86 degrees water for a month. Water tested with Autidefy brand for two hours. In the right situation this magnet thermometer is the best available.

Overall Score
5.0


(3 Points)

8. 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
  • Quality
  • Value For Money
  • Affordability

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


(1017 Points)

9. Abnaok Salinity Tester, Sea Specific Gravity Test for Fish Tank Pond Water Saltwater Freshwater, Acc...

User Ratings: 68 14

Abnaok First Impressions

"Great price too."

So far, they're all doing their job in my four tanks and I am quite content. It worked great and I highly recommend it! So versatile, I can read the temperatures literally anywhere. I can't say which is the most accurate and don't really care. The lid is textured aluminum, and the suction cups don't stick to that. So versatile, I can read the temperatures literally anywhere. As you can see from my photos, in both°F and°C, all six are within.

  • Abnaok Salinity Tester, Sea Specific Gravity Test for Fish Tank Pond Water Saltwater Freshwater, Accurate Automatic Hydrometer
  • Safe Material:Made of plastic,aquarium clear Automatic Accurate Readable SaltWater Hydrometer.
  • Durable Clear Acrylic:Accurate, durable, and easy to read your marine aquarium's salt level and specific gravity,Small and waterproof.if the specific gravity between 1.000 - 1.019,show that the specific gravity is small;if the specific gravity between 1.020 - 1.023,show that the specific gravity is nomal;if the specific gravity between 1.024 - 1.030,show that the specific gravity is big;
  • Clearly Safe Zone Indicated:Includes solinity and specific grovity scales.The outside rang of scale indicates salinity(PPT).The inside range of scale indicates gravity.And with safe zone clearly indicated.Range of use: 0-40 degrees (1.000-1.030).If the salinity ppt between 32 - 40,show that the salinity hydrometer is high;If the salinity ppt between 27 - 31,show that the salinity hydrometer is normal; If the salinity ppt between 0 - 26,show that the salinity hydrometer is light.
  • Wide Usage:Fit for brackish and marine aquariums.Perfect for testing both salinity and specific gravity of your brackish and marine tank.Includes solinity and specific grovity scales.Suitable for fresh water and sea water.
  • Easy to Read and Use:The easy-to-read swing-arm pointer and extra wide stable base provide an accurate test result.
  • Manufacture: Abnaok
  • Editor's Impressions Of The Abnaok
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Abnaok Final Thoughts

"They are within 0."

The units each had a battery in place and situated for immediate use. My poor fish was in 86 degrees water for a month. I have it in both my aquariums now. 6 inch long Bala Sharks that are known to be very unruly and boisterous. For the price I'll probably end up putting these in all of my aquariums. I just wrote it off as a minor loss. I think the people who said the suction cup broke.

Overall Score
4.1


(8 Points)

10. Aquarium Sticker Thermometer, Precise Measurement of Tank’s Temperature, Ideal for Fish, Shrimps &...

User Ratings: 69 7

SunGrow First Impressions

"Love this product!"

I have bought many many temperature gauges for my various fish tanks over the years. All were Close enough for a fish tank and other uses. Then she followed up again on that, asking if they had arrived and were okay. One being a very expensive digital. I find that the temps are accurate, and this product gives added peace of mind. I ordered this guy and it was 6 degrees hotter than the digital! One of my aquariums is glass, and the other two are plastic.

  • Aquarium Sticker Thermometer, Precise Measurement of Tank’s Temperature, Ideal for Fish, Shrimps & Turtles, Ensures pet Health, Increases Lifespan, Peel & Stick Installation, 2 Color Indicators
  • ✔ MEASURES TANK TEMPERATURE FOR PROPER & CONSISTENT MONITORING --- Maintaining an aquarium tank with pets means having to actively measure the temperature of their living environment. Always being aware of its correct hotness or coldness level can make you do necessary adjustments to ensure that it is consistently ideal for your pets. Aquarium Sticker Thermometer by SunGrow will help you determine if your aquatic pets are living in a suitable environment condition.
  • ✔ HELPS PROTECT YOUR AQUARIUM PETS FROM DISEASES AND DEATH --- Fish and amphibians are highly sensitive even to a slight change in temperature. It is a must to keep their surroundings as close as possible to their natural habitat. An inconsistent aquatic environment can cause bettas, turtles to be stressed, sick or even die.
  • ✔ AIDS IN REPRODUCTION & LONGER LIFESPAN --- Cold-blooded species change with the temperature of their surroundings. Keeping it right along with proper nutrition can triple their lifespan. Any big difference from the ideal will directly affect the breeding process. It also affects their growth development, activity levels and overall wellness.
  • ✔ EASY MONITORING OF TEMPERATURE WITH 2-COLOR INDICATORS --- It’s time to stop the guessing game of aquarium temperature because this handy sticker thermometer will give you the precise range of your tank’s temperature with 2-color indicators. Blue color depicts the exact temperature. When you spot both Green and Blue colors on the strip, it indicates that the temperature is between them.
  • ✔ NO SUCTION CUPS OR BATTERIES NEEDED --- This self-adhesive strip can be installed in two easy steps: Peel & Stick! No need to worry about suction cups or batteries and experience a worry-free monitoring. Measuring 5.1” tall by 0.7” wide, it can read a temperature range between 64 and 93 Degree Fahrenheit / 18 and 34 Degree Celsius. Please note that Fahrenheit is in big bold letters and Celsius is in small.
  • Manufacture: Luffy Pets Collection
  • Editor's Impressions Of The SunGrow
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

SunGrow Final Thoughts

"Fish are doing very well."

The units each had a battery in place and situated for immediate use. I used these on a number of my aquariums that have discus fish in them. The lid is textured aluminum, and the suction cups don't stick to that. Works well in my betta tank, but provide a couple hours for it to read temp changes. We are using them to measure various temperatures inside and outside of a motorhome. All were Close enough for a fish tank and other uses. The digital display is nice and small as well.

Overall Score
4.3


(53 Points)

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