Editor's Choice - Our Favorite API Aquarium Thermometers

1. API 2343 Stress Zyme+ Thermometers

API 2343 First Impressions

"Changed to 5-stars now."

Very impressed, I have now had them in used for a month so far. I ordered a new one and it works GREAT! I recommend gluing the suction cups in place where needed for long-term installation. I don't think i'll ever be able to trust a digital thermometer again. I came here to give this product a positive review. Have checked them against the glass thermometers and the accuracy is right on. One extra battery came with each unit.

  • API 2343 Stress Zyme+ Thermometers
  • This product is easy to use
  • This product adds a great Value
  • This product is Manufactured in United States
  • Item Package weight : 7.06 pounds
  • Manufacture: Prime Pet Deals - Code 2
  • Product Dimensions: 9.95 x 7.05 x 2.2 inches; 4 Ounces
  • Editor's Impressions Of The API 2343
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='4.7']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='5']

API 2343 Final Thoughts

"It works great."

He was moving slow in the winter and we realized he needed a heater! 6 in a pack, extra batteries, easy set up, great price. The lid is textured aluminum, and the suction cups don't stick to that. Since adding one of these, it has been much easier to monitor the temp of my tanks. The temperature fluctuated a lot with it. I am extremely pleased with this product. My poor fish was in 86 degrees water for a month.

Overall Score
5.0

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

2. SHARPTEMP-V Veterinary Thermometer. Fast, Accurate Temperatures in 8-10 Sec. Beeps When Ready. Stain...

User Ratings: 74 7

SHARPTEMP-V First Impressions

"Great product!"

For something so cheap, they are working remarkably well. They are within a degree or two of other thermometers I've checked to compare them. And is easily hidden behind a plant. When and if we run out of this batch, I'll instantly order another batch. The units each had a battery in place and situated for immediate use. Who knows, whatever it was, it was revolting! The temperature fluctuated a lot with it.

  • SHARPTEMP-V Veterinary Thermometer. Fast, Accurate Temperatures in 8-10 Sec. Beeps When Ready. Stainless-Steel Probe w/Rounded Tip. Safe for All Farm Animals & Pets.
  • DIGITAL VETERINARY THERMOMETER: The Sharptemp-V Veterinary Thermometer is a versatile digital thermometer built rugged enough for heavy- duty use on-farm, in the stable, at the veterinary clinic and at home. The 4-inch probe length meet the needs of all types of large livestock, horses, and companion animals.
  • FAST & ACCURATE: Fast, accurate temperature readings in 8 to 10 seconds depending on conditions. Measures from 90 °F to 107°F and is accurate to +/- 0.1 F°. The large easy-read 3/8”-high LCD blinks while stabilizing then emits an audible beep when an accurate temperature is reached. Auto shut-off after 9 minutes. This Veterinary Thermometer reads Fahrenheit ( °F) only.
  • VERSATILE & SAFE: Sharptemp Veterinary Thermometer is for oral or rectal use in animals. Stainless steel probe is 3/16” (5mm) diameter with blunt end for safe insertion. Normal temperatures for common pets and farm animals are printed on the back for convenient reference. The tough durable plastic body and surgical-grade stainless-steel probe surfaces are designed for easy cleaning and disinfection.
  • BUILT TOUGH: Tough, durable, plastic thermometer BODY (without probe) measures 4” x 1-1/8” x 5/8” and fits ergonomically in hand. The woven nylon lanyard loops comfortably over wrist. The hard-plastic friction-fit probe cover prevents damage and slides on and off with ease. Includes one user- replaceable LR44 hearing aid battery and a sturdy, protective polyethylene storage case.
  • IN THE BOX: One Sharptemp digital veterinary thermometer with 4-inch probe, probe cover, battery, instructions and sturdy plastic storage case. CE- approved. One-year warranty. Click “ADD to CART” and start measuring animal temperatures fast and accurately with the Sharptemp Veterinary Thermometer. Your satisfaction is 100% guaranteed!
  • Manufacture: Contran Corporation
  • Editor's Impressions Of The SHARPTEMP-V
  • Thermometer Accuracy [star rating='4.1']
  • Quality [star rating='4.7']
  • Value For Money [star rating='4.7']
  • Affordability [star rating='4.2']

SHARPTEMP-V Final Thoughts

"6 tenths of a degree."

The plastic from the suction cup quickly turned from a clear to a milky white. This is my first 5 star review out of many many reviews on Amazon. Excellent working for our bearded dragon tank. I got root rot after light leaks and high water temps. These are the perfect size to be easily read while not being obtrusive. My 50+ eyes cannot read a regular tank thermometer without squinting. It started working as soon as I put it in and has been working ever since.

Overall Score
4.5

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

3. Smartcoco Digital LCD Screen Sensor Aquarium Thermometer Wired Aquarium Fish Tank Reptile Box Temp M...

User Ratings: 54 26

Smartcoco First Impressions

"Never had any problems."

It will make you wonder why nobody thought of it before. Very accurate, have checked it with other thermometers as well. So much so that I purchased a second set of 6. 6 in a pack, extra batteries, easy set up, great price. I guess these units do not like saltwater. All were Close enough for a fish tank and other uses. They are within a degree or two of other thermometers I've checked to compare them.

  • Smartcoco Digital LCD Screen Sensor Aquarium Thermometer Wired Aquarium Fish Tank Reptile Box Temp Meter Electronic Temperature Measurement
  • Stylish and exquisite digital thermometer for Aquarium
  • LCD screen & High quality suction base & long sensor cable and switch of °C / °F
  • Size: 2.3 x 1.5 x 0.6 in / 5.8×3.7×1.6 cm
  • Suitable for fish tank, reptile box, diving pet box and more
  • Package included: 1* Aquarium Thermometer
  • Manufacture: Smartcoco
  • Editor's Impressions Of The Smartcoco
  • Thermometer Accuracy [star rating='3.7']
  • Quality [star rating='4.5']
  • Value For Money [star rating='4.3']
  • Affordability [star rating='4.1']

Smartcoco Final Thoughts

"Suction cups are okay."

As you can see from my photos, in both°F and°C, all six are within. We are using them to measure various temperatures inside and outside of a motorhome. Simple fix, you adjust the thermometer within the suction cup and VIOLA! I find that the temps are accurate, and this product gives added peace of mind. For something so cheap, they are working remarkably well. I've checked it against two other thermometers that are accurate. Instead she sent a new package of two, both of which work.

Overall Score
3.8

[star rating="3.8"]
(6 Points)

4. Evolution Areometer/Hydrometer and Thermometer

User Ratings: 79

Evolution First Impressions

"Easy to setup in tank."

Ordered three of these and they do the job. Ambient room temperature measures 72. Set all six probes up in a terrarium with a constant temp of 88. I use a small flashlight if I don't want to brighten the area. Far more accurate than the usual small glass ones or external LCD strips. I tested this in a cup crammed full of ice and some water. The suction works for a month at a time- in pool and hot tub circulation.

  • Evolution Areometer/Hydrometer and Thermometer
  • Aquarium Glass Hydrometer With Thermometer
  • Green indicators for ideal range of water temperature and specific gravity for most salt water / marine aquariums
  • With temperature test function. Measure both, Temperature and Specific Gravity of the water.
  • Can also be used for other aspects of liquid density measurement
  • Manufacture: SMF-Aquaristik
  • Editor's Impressions Of The Evolution
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='5']
  • Value For Money [star rating='4.8']
  • Affordability [star rating='3.9']

Evolution Final Thoughts

"Easy to setup in tank."

For the price I'll probably end up putting these in all of my aquariums. I got the second one as a bonus that I'm now using in my old tank. 6F all six took about three minutes to read between 88. For something so cheap, they are working remarkably well. I have mine on my 60 gallon cube marine tank. It is always where yo last put it and it is very easy to see and read. He was moving slow in the winter and we realized he needed a heater!

Overall Score
4.6

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

5. Stick-on Thermometer for Tortoise and Reptiles, Creates Ideal Habitat, Keeps Turtle, Gecko, Dragon, ...

User Ratings: 67 19

SunGrow First Impressions

"No issues."

The digital display itself is easy to read at a glance. I got root rot after light leaks and high water temps. So far, they're all doing their job in my four tanks and I am quite content. So much easier than the ones that hang on the inside. It is my opinion that everyone should have these that are in the Aquarium Hobby. I bent it a little bit and when I put it back it was perfectly fine. It will make you wonder why nobody thought of it before.

  • Stick-on Thermometer for Tortoise and Reptiles, Creates Ideal Habitat, Keeps Turtle, Gecko, Dragon, and Snake Healthy, Peel-and-Go, Accurate Monitoring of Vivarium
  • ✔ MAINTAINS IDEAL ENVIRONMENT FOR TORTOISE AND REPTILES --- Cold-blooded species such as snakes, turtles and tortoises cannot change their body temperature independently with their environmental temperature. By using a Stick-on Thermometer by SunGrow, you will be able to monitor and maintain correct temperatures that directly affect the overall health of a domestic turtle or tortoise.
  • ✔ REGULATES BODY TEMPERATURE OF COLD-BLOODED SPECIES --- Since body temperature determines the rise and fall of activity levels of these cold-blooded animals, they need to be able to regulate theirs along with their environment. Failure to do this may lead to health problems.
  • ✔ KEEPS YOUR COLD-BLOODED PET HEALTHY --- On-stick Thermometer helps in determining if your reptiles and amphibians live in ideal temperature conditions. Living in an unsuitable environmental temperature can cause lack of appetite and may be the cause behind ill-health of your prized pets.
  • ✔ FOR LONG LIFESPAN --- A healthy turtle may contract maladies if ideal living conditions aren’t provided and not properly monitored. We should never rely on what feels warm to humans as these may not be what your pets need. You’ll notice changes in turtles or tortoises' health, if they are kept between 65 and 72 degrees Fahrenheit for a prolonged period of time.
  • ✔ EASY TO INSTALL, USE AND READ --- Simply peel and stick and experience no worry tortoise and reptiles handling! Stick-on Thermometer by SunGrow has a simple design which complements your easy to care lifestyle for your pets. It is black in color with big, easy to read fonts on white color. Measuring 5.2” tall by 0.7” wide (13cm x 1.8cm), it also has a blue and green indicator that tells you the temperature it reads.
  • Manufacture: Luffy Pets Collection
  • Editor's Impressions Of The SunGrow
  • Thermometer Accuracy [star rating='4.4']
  • Quality [star rating='3.1']
  • Value For Money [star rating='4.5']
  • Affordability [star rating='4']

SunGrow Final Thoughts

"I AM SO HAPPY."

We are using them to measure various temperatures inside and outside of a motorhome. It worked great and I highly recommend it! I have this thermometer on all my tanks. It is easy to use and install it'disappears' in your tank it is so unobtrusive. I had my heater set at 73-degrees and the thermometers showed 74. I guess these units do not like saltwater. I find that the temps are accurate, and this product gives added peace of mind.

Overall Score
4.1

[star rating="4.1"]
(17 Points)

6. Veanic 4-Pack Digital Aquarium Fish Tank Thermometer Terrarium Water Temperature Meter Gauge with Wa...

Veanic First Impressions

"Fish are doing very well."

This is my first 5 star review out of many many reviews on Amazon. As you can see from my photos, in both°F and°C, all six are within. Only thing I don't love is how long the cord is. He acted aggressively towards it and so I ultimate ended up removing it due to that. 49 thermometer that is 100% accurate. My only complaint is that they tend to be a one time use. I used to have a large hang in the side tank that you couldn't miss.

  • Veanic 4-Pack Digital Aquarium Fish Tank Thermometer Terrarium Water Temperature Meter Gauge with Water-Resistant Sensor Probe for Reptile Turtle Incubators
  • The digital aquarium thermometer helps you accurately monitor the temperature of your aquatic habitat; suitable for freshwater or marine aquariums.
  • The digital thermometer combins a water-resistant sensor probe, you can accurately and quickly monitor the temperature of your terrarium.
  • This digital thermometer with 3 ft insulated wire, can switch between celsius(℃) and fahrenheit (℉) .
  • Temperature measuring range: -58℉-158℉(-10℃-70℃ ); Temperature measurement accuracy: ±2℉(±1℃).
  • Perfect to use in brooders, reptile tank, hamster cages,aquarium, fish tank, pet keeping, gardening and other places where you want.
  • Manufacture: Veanic
  • Batteries: 1 LR44 batteries required. (included)
  • Editor's Impressions Of The Veanic
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='5']
  • Value For Money [star rating='4.9']
  • Affordability [star rating='5']

Veanic Final Thoughts

"Highly Recommended."

I don't think i'll ever be able to trust a digital thermometer again. If the digital display starts to get dim, it's time for a new battery. I got root rot after light leaks and high water temps. I find that the temps are accurate, and this product gives added peace of mind. I guess these units do not like saltwater. I bought these for my dwc reservoirs. I recommend gluing the suction cups in place where needed for long-term installation.

Overall Score
5.0

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

7. 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)

8. Digital Aquarium Thermometer

Zoo Med First Impressions

"These are great!"

Water tested with Autidefy brand for two hours. So far I've been very thrilled with these. Since it is a mercury thermometer, it is very accurate. 6F all six took about three minutes to read between 88. So much easier than the ones that hang on the inside. The suction cups work well anywhere I have placed it it has not Fallen. A bit large for anything smaller than 5 gallons, but that's to be expected.

  • Digital Aquarium Thermometer
  • 8.5
  • Manufacture: ZOO MED LABORATORIES
  • Editor's Impressions Of The Zoo Med
  • Thermometer Accuracy [star rating='2.9']
  • Quality [star rating='2.7']
  • Value For Money [star rating='2.7']
  • Affordability [star rating='2']

Zoo Med Final Thoughts

"Great product!"

These digital thermometers are great and there is no guesswork involved. These are the perfect size to be easily read while not being obtrusive. Excellent working for our bearded dragon tank. Then she followed up again on that, asking if they had arrived and were okay. When I set up my newest tank I will be getting another one of these. I just wrote it off as a minor loss. 6 in a pack, extra batteries, easy set up, great price.

Overall Score
3.0

[star rating="3"]
(1 Points)

9. OASE Indoor Aquatics Digital Thermometer

OASE Indoor Aquatics 48492 First Impressions

"I like this."

This temperature read a perfect 32 degrees. I used these on a number of my aquariums that have discus fish in them. I had my heater set at 73-degrees and the thermometers showed 74. The lid is textured aluminum, and the suction cups don't stick to that. This is how you calibrate a thermometer. One extra battery came with each unit. I don't think i'll ever be able to trust a digital thermometer again.

  • OASE Indoor Aquatics Digital Thermometer
  • The digital thermometer can be bond to the exterior of the Aquarium for simple, No mess readings
  • Simple to read digital display
  • Displays temperature in Celsius
  • Includes 1 LR1130 battery
  • Manufacture: OASE
  • Product Dimensions: 2.4 x 0.7 x 1.9 inches; 1.23 Ounces
  • Editor's Impressions Of The OASE Indoor Aquatics 48492
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='5']
  • Value For Money [star rating='4.7']
  • Affordability [star rating='5']

OASE Indoor Aquatics 48492 Final Thoughts

"These are great!"

I came here to give this product a positive review. I have it in both my aquariums now. I have always had trouble reading the color temp. Since it is a mercury thermometer, it is very accurate. It will make you wonder why nobody thought of it before. I just wrote it off as a minor loss. Love it, it's easy to read and keeps an accurate temp.

Overall Score
5.0

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

10. 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)

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