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
  • Quality
  • Value For Money
  • Affordability

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


(3 Points)

2. Aoile Aquarium Thermometer for Fish Tank,Aquarium Waterproof Hydraulic Gauge Submersible Glass The...

Aoile First Impressions

"There is no question."

These digital thermometers are great and there is no guesswork involved. The only reason I didn't give this 5 stars is because my betta fish didn't like it. I used these on a number of my aquariums that have discus fish in them. Who knows, whatever it was, it was revolting! One of my aquariums is glass, and the other two are plastic. So far I've been very thrilled with these. I ordered a new one and it works GREAT!

  • Aoile Aquarium Thermometer for Fish Tank,Aquarium Waterproof Hydraulic Gauge Submersible Glass Thermometer with Suction Cup 14CM
  • --Aquarium and alien reptile thermometers.
  • --Made of quality glass, clear and easy to read.
  • --Stable, long-term use.
  • --Suitable for land and water.
  • --Strong suction cup.
  • Manufacture: Aoile
  • Item Weight: 0.63 Ounces
  • Editor's Impressions Of The Aoile
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Aoile Final Thoughts

"Close enough I reckon!"

One extra battery came with each unit. So, in those cases, I find it easier to simply replace it. Have checked them against the glass thermometers and the accuracy is right on. 82 PER THERMOMETER with battery included. Place it on your aquarium and you are good to go. I got root rot after light leaks and high water temps. All are pretty accurate within one degree as claimed.

Overall Score
5.0


(1 Points)

3. Slaxry Fast-Read Thermometer Easy Setup Stick On Fish Tank Glass Thermometer Temperature Gauge Heate...

User Ratings: 74 26

Slaxry First Impressions

"Buy these."

So far, they're all doing their job in my four tanks and I am quite content. One extra battery came with each unit. You dont HAVE to stick the display onto your tank. It is easy to use and install it'disappears' in your tank it is so unobtrusive. Sure enough the digital thermometer was way off by 6 degrees! One extra battery came with each unit. He was moving slow in the winter and we realized he needed a heater!

  • Slaxry Fast-Read Thermometer Easy Setup Stick On Fish Tank Glass Thermometer Temperature Gauge Heater Sticker for Aquarium, Reptile, Turtles
  • Measure the temperature of your fish tank, DIY Brew Beer and wine barrel, Terrarium, Greenhouse, Vivarium and any sort of pet tank, or any place in your house
  • Dimension: 13 cm/5.12" of length, 1.8 cm/0.71" of width.
  • Measurement range: Celsius degree18-34°C, Fahrenheit degree 64-93°F.
  • No battery and suction cup to worry about.
  • The thermometer changes its color according to the surrounding temperature. If the surrounding temperature is 27°C, then the background of scale mark 27°C will turn colorful and other scale marks remain black.
  • Manufacture: Slaxry
  • Editor's Impressions Of The Slaxry
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Slaxry Final Thoughts

"A solid five stars."

Good cheap accurate aquarium thermometer. Good cheap accurate aquarium thermometer. This thermometer is spot on accurate. This temperature read a perfect 32 degrees. So far, they're all doing their job in my four tanks and I am quite content. They are within a degree or two of other thermometers I've checked to compare them. I can't say which is the most accurate and don't really care.

Overall Score
4.0


(14 Points)

4. UPLY Betta Aquarium Thermometer LCD Digital Fish Tank Thermometer Waterproof Tank Thermometer with S...

User Ratings: 49

UPLY First Impressions

"It's accurate I tell you."

At least in the first 3 months of use. I don't think i'll ever be able to trust a digital thermometer again. You can glue, tape or simply cover the cords in the tank to keep them discreet. The plastic from the suction cup quickly turned from a clear to a milky white. One being a very expensive digital. I tested this in a cup crammed full of ice and some water. I'm pretty sure those reviewers have acrylic tanks.

  • UPLY Betta Aquarium Thermometer LCD Digital Fish Tank Thermometer Waterproof Tank Thermometer with Suction Cup Fresh Water Salt Water
  • Best Thermometer For Your Fish --- How to keep our fish healthy? The right temperature is critical. Every fish has a water temperature suitable for them to survive. As a breeder, we need to keep track of the temperature of the water in our fish tanks. Therefore, having an an accurate and effective aquarium thermometer is important to ensure the perfect temperature for your pet fish.
  • EASY TO READ --- No need to stop, no need to observe the scale, only you need to gently glance, you can easily get an accurate water temperature from UPLY Aquarium Thermometer's Display. Very Easy!!
  • COMPLETELY WATERPROOF --- UPLY aquarium thermometer uses waterproof ring design, can completely submerge into the water, water temperature measurement is more accurate. ( Your Betta can also use it as a rest leaf.)
  • WIRELESS --- The extra cables will make your tank look messy and affect the activity space of your fish. UPLY Aquarium Thermometer doesn't have any extra lines, and the simple design lets your use easier
  • WIDE TEMPERATURE RANGE --- Temperature range -58°F to 158°F, allows you to use this thermometer at any temperature. Not only a fish tank, you can use it wherever you want.
  • Manufacture: UPLY
  • Batteries: 1 LR44 batteries required. (included)
  • Editor's Impressions Of The UPLY
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

UPLY Final Thoughts

"Doing the math."

It will make you wonder why nobody thought of it before. I bent it a little bit and when I put it back it was perfectly fine. Who knows, whatever it was, it was revolting! Love it, it's easy to read and keeps an accurate temp. A battery can last you up to six months, I'd say, but expect more like three. I ordered this guy and it was 6 degrees hotter than the digital! When and if we run out of this batch, I'll instantly order another batch.

Overall Score
3.5


(2 Points)

5. Fluval Submersible Digital Thermometer

User Ratings: 63 12

Fluval 11194 First Impressions

"Perhaps it's my fault."

Very impressed, I have now had them in used for a month so far. My only complaint is that they tend to be a one time use. This thermometer is spot on accurate. So much easier than the ones that hang on the inside. Sure enough the digital thermometer was way off by 6 degrees! I have this thermometer on all my tanks. 6 inch long Bala Sharks that are known to be very unruly and boisterous.

  • Fluval Submersible Digital Thermometer
  • Features a large LED display
  • Fully submersible thermometer
  • Large screen for easy reading
  • Country Of Origin: China
  • Manufacture: Rolf C. Hagen (USA) Corp.
  • Product Dimensions: 1 x 2.6 x 4.9 inches; 0.81 Ounces
  • Editor's Impressions Of The Fluval 11194
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Fluval 11194 Final Thoughts

"It sticks very firmly."

I needed a solution that was not breakable and these do the trick! I have this thermometer on all my tanks. The suction works for a month at a time- in pool and hot tub circulation. Since it is a mercury thermometer, it is very accurate. My 50+ eyes cannot read a regular tank thermometer without squinting. Ordered three of these and they do the job. I just wrote it off as a minor loss.

Overall Score
3.9


(53 Points)

6. Polarbear's Pet Shop New! Digital LCD Aquarium Fish Thermometer Water Terrarium Black Free Batteries...

Polarbear's Pet Shop First Impressions

"Which is good."

As you can see from my photos, in both°F and°C, all six are within. It is my opinion that everyone should have these that are in the Aquarium Hobby. These are the perfect size to be easily read while not being obtrusive. We are using them to measure various temperatures inside and outside of a motorhome. They are within a degree or two of other thermometers I've checked to compare them. I bent it a little bit and when I put it back it was perfectly fine. And is easily hidden behind a plant.

  • Polarbear's Pet Shop New! Digital LCD Aquarium Fish Thermometer Water Terrarium Black Free Batteries
  • LCD display
  • Switch between °C and °F
  • Press ''FSW'' for 3 seconds to power off
  • Temperature Range: -50 °C ~ +70°C
  • Cable length: approx. 3 feet
  • Manufacture: Polarbear's Pet Shop
  • Editor's Impressions Of The Polarbear's Pet Shop
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Polarbear's Pet Shop Final Thoughts

"They all were within."

Put them all in the same tank and they read very close to each other. 2 deg, if it was 32, it would be a SOLID block of ice. So this is the extreme end of the high temperature range. He acted aggressively towards it and so I ultimate ended up removing it due to that. You can glue, tape or simply cover the cords in the tank to keep them discreet. I have kept aquariums for about 45 years. The units each had a battery in place and situated for immediate use.

Overall Score
5.0


(1 Points)

7. Amagle Indoor Digital Thermometer Aquarium Submersible Fish Tank Terrarium LCD Digital Thermometer

User Ratings: 51

Amagle YG_DMH002 First Impressions

"Or left a mark."

I had my heater set at 73-degrees and the thermometers showed 74. 50 thermometers, reads much easier and no suction cup residue, also looks better. One extra battery came with each unit. 89 I could buy Six Thermometers with Six included batteries. The units each had a battery in place and situated for immediate use. 6F all six took about three minutes to read between 88. I can't say which is the most accurate and don't really care.

  • Amagle Indoor Digital Thermometer Aquarium Submersible Fish Tank Terrarium LCD Digital Thermometer
  • Celsius or Fahrenheit selectable
  • Measure both tank and indoor temperature
  • Large LCD display simultaneously showing aquarium & ambient temperature
  • With adhesive tape at back side for easy sticking on aquarium tank
  • Sensor at the back of the thermometer to measure water temperature from glass. Therefore, normally it would measure 1 degree higher than actual water
  • Manufacture: Amagle
  • Item Weight: 1.1 pounds
  • Product Dimensions: 5.51 x 3.15 x 0.39 inches
  • Editor's Impressions Of The Amagle YG_DMH002
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Amagle YG_DMH002 Final Thoughts

"It's accurate I tell you."

Only thing I don't love is how long the cord is. The digital display is nice and small as well. I have kept aquariums for about 45 years. I ordered this guy and it was 6 degrees hotter than the digital! The units each had a battery in place and situated for immediate use. 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.

Overall Score
4.0


(3 Points)

8. 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)

9. AUTIDEFY LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature

User Ratings: 55 17

AUTIDEFY First Impressions

"Would buy again."

It is about 6 inches in length and roughly an inch wide. Now if it falls into a sink full of water, it's not a problem. 6 in a pack, extra batteries, easy set up, great price. It works equally well on all of them. 89 I could buy Six Thermometers with Six included batteries. Ordered three of these and they do the job. Excellent working for our bearded dragon tank.

  • AUTIDEFY LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature
  • Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water)
  • Digital °C /° F thermometer;Temperature range -50°c ~ + 70°c,Operating temperature -10°c ~ +50°c
  • Easy to apply suction cup and easy to read LCD screen; Temperature readings to within 0.1 degree
  • Powered by one LR44 button cell (included)
  • Package Contents:4 x Digital Thermometer; 4 x Battery; 4 x Probe
  • Manufacture: AUTIDEFY
  • Editor's Impressions Of The AUTIDEFY
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

AUTIDEFY Final Thoughts

"Close enough I reckon!"

2 deg, if it was 32, it would be a SOLID block of ice. A battery can last you up to six months, I'd say, but expect more like three. It will make you wonder why nobody thought of it before. So versatile, I can read the temperatures literally anywhere. Have checked them against the glass thermometers and the accuracy is right on. Then she followed up again on that, asking if they had arrived and were okay. This is my first 5 star review out of many many reviews on Amazon.

Overall Score
3.9


(138 Points)

10. Fluval Edge Digital Aquarium Thermometer

User Ratings: 68 6

Fluval 11206 First Impressions

"Suction cups are okay."

I've checked it against two other thermometers that are accurate. 6 inch long Bala Sharks that are known to be very unruly and boisterous. Works well in my betta tank, but provide a couple hours for it to read temp changes. When and if we run out of this batch, I'll instantly order another batch. You dont HAVE to stick the display onto your tank. Instead she sent a new package of two, both of which work. This company is taking the long term view of how to do business right.

  • Fluval Edge Digital Aquarium Thermometer
  • accurate and easy-to-read thermometer
  • mounts easily on outside of glass
  • ideal for fresh and saltwater tanks
  • temperature range of 64 to 86 degrees fahrenheit
  • Age range description: All ranges
  • Manufacture: Fluval
  • Product Dimensions: 0.2 x 2.9 x 7 inches; 0.16 Ounces
  • Editor's Impressions Of The Fluval 11206
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Fluval 11206 Final Thoughts

"2-degrees."

I just wrote it off as a minor loss. My poor fish was in 86 degrees water for a month. Then is started to give a low reading, and it is not reading the correct temperature. Now that the chickens are grown, I have one out in the coop as well. 6F all six took about three minutes to read between 88. I've checked it against two other thermometers that are accurate. All were Close enough for a fish tank and other uses.

Overall Score
4.3


(948 Points)

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