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. Sunsbell Aquarium Thermometer Digital Touch Screen Fish Tank Thermometer with Large LCD Display

Sunsbell 6M1048127R0PHUV First Impressions

"It is within."

Set all six probes up in a terrarium with a constant temp of 88. 82 PER THERMOMETER with battery included. I ordered this guy and it was 6 degrees hotter than the digital! My 50+ eyes cannot read a regular tank thermometer without squinting. I think the people who said the suction cup broke. Excellent working for our bearded dragon tank. It is easy to use and install it'disappears' in your tank it is so unobtrusive.

  • Sunsbell Aquarium Thermometer Digital Touch Screen Fish Tank Thermometer with Large LCD Display
  • Backside temperature sensor can stick on the outside glass of the fish tank prevent water infiltration and electronic Oxidation, compact design with Large Crystal Touch Screen makes it easier to read the temperature far away, stands out among other Fish Tank thermometers.
  • 3.2 large glass screen is larger than most of the thermometers, large temperature display on transparent screen, will not block your view.
  • With an accurate temperature sensor stick on the surface of the fish tank, this Digital aquarium thermometer will display accurate temperature for fish tank, reading from 0°C to 70°C / 32°F - 158°F, accurate to 0.1°.
  • Pull down the red battery cover below the screen, insert battery, close it, stick on and read the tank temperature. press up or down to switch °C / °F.
  • Suitable for different water types such as fresh water, tap water, salty water, marine water and monitors the living temperature for reptile such as lizard, turtle. Also, it can be used for DIY brew beer and wine barrel, terrarium, greenhouse, pet tank thermometer.
  • Manufacture: Sunsbell
  • Product Dimensions: 2.95 x 2.95 x 0.28 inches; 2.82 Ounces
  • Editor's Impressions Of The Sunsbell 6M1048127R0PHUV
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Sunsbell 6M1048127R0PHUV Final Thoughts

"Very accurate."

I removed the batteries of the units I wasn't using right away. I have to admit I had two reasons for buying six. I have mine on my 60 gallon cube marine tank. Place it on your aquarium and you are good to go. It is about 6 inches in length and roughly an inch wide. The plastic from the suction cup quickly turned from a clear to a milky white. I used to have a large hang in the side tank that you couldn't miss.

Overall Score
4.0


(1 Points)

3. Dual Dial Reptile Thermometer Hygrometer Gauge for Lizard Tortoise Spider Chameleon Reptiles Terrari...

N / A First Impressions

"1 degree of each other."

Sure enough the digital thermometer was way off by 6 degrees! This thermometer is spot on accurate. I don't think they are backlit but for the price they are still nice. This thermometer is spot on accurate. I have kept aquariums for about 45 years. Excellent working for our bearded dragon tank. The digital display is nice and small as well.

  • Dual Dial Reptile Thermometer Hygrometer Gauge for Lizard Tortoise Spider Chameleon Reptiles Terrarium Tank
  • Temperature measurement range: -30 to 50°C; humidity measurement range: 0% to 100% RH
  • Simultaneous temperature and humidity measurement, mechanical induction, no need for battery, with silent effect.
  • The measuring distance is far, and the scale number can also be read clearly at a long distance. There are text and color blocks to distinguish comfort level
  • The sensing speed is fast, temperature and humidity are sensed at the same time, and the value is accurate.
  • If you have any question about our product, please contact us, we will reply and help you in 24 hours
  • Manufacture: N / A
  • Product Dimensions: 6.1 x 2.95 x 0.59 inches; 2.19 Ounces
  • Batteries: Unknown batteries required.
  • Editor's Impressions Of The N / A
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

N / A Final Thoughts

"Would recommend!"

I have this thermometer on all my tanks. I don't think i'll ever be able to trust a digital thermometer again. Checked with temp gun and the terrarium was on target at 88. So far I've been very thrilled with these. These digital thermometers are great and there is no guesswork involved. My poor fish was in 86 degrees water for a month. I don't think i'll ever be able to trust a digital thermometer again.

Overall Score
3.0


(1 Points)

4. Vacally New Glass Meter Aquarium Fish Tank Water Thermometer Suction Cup Aquarium Glass Thermometer ...

User Ratings: 57

Vacally Aquarium Accessories First Impressions

"Very accurate."

I used these to raise chicks, and in my parrot cages. Now if it falls into a sink full of water, it's not a problem. The suction will never be the same. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. It is large enough to see without being obtrusive. 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.

  • Vacally New Glass Meter Aquarium Fish Tank Water Thermometer Suction Cup Aquarium Glass Thermometer Salt Marine
  • ❤Material: glass ❤Test range: 0 ~ 40 ℃ ❤ Size: about 10.5cm ❤Quantity: 1
  • ❤Clearly readable scale tells you to understand the temperature at two degrees Celsius and Fahrenheit.
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  • Manufacture: SJHDFI49
  • Product Dimensions: 4.13 x 0.39 x 0.39 inches; 0.6 Ounces
  • Editor's Impressions Of The Vacally Aquarium Accessories
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Vacally Aquarium Accessories Final Thoughts

"Great price."

Ordered three of these and they do the job. It is easy to use and install it'disappears' in your tank it is so unobtrusive. If the digital display starts to get dim, it's time for a new battery. I got the second one as a bonus that I'm now using in my old tank. So this is the extreme end of the high temperature range. 49 thermometer that is 100% accurate. And I just really started to doubt it.

Overall Score
4.6


(2 Points)

5. Decdeal TPM10 Aquarium Thermometer Instant Read Digital Fish Tank Water Temperature Measurement Tool...

Decdeal First Impressions

"It works great."

The temperature fluctuated a lot with it. I used these on a number of my aquariums that have discus fish in them. I used these on a number of my aquariums that have discus fish in them. Far more accurate than the usual small glass ones or external LCD strips. You dont HAVE to stick the display onto your tank. When and if we run out of this batch, I'll instantly order another batch. I use a small flashlight if I don't want to brighten the area.

  • Decdeal TPM10 Aquarium Thermometer Instant Read Digital Fish Tank Water Temperature Measurement Tool with Waterproof Probe LED Display Gauge
  • Mini size and very light in weight.
  • Fast reading system achieves an accurate temperature reading within just a few seconds.
  • Ultra-clear screen LCD display showing temperature unit of Celsius.
  • With 1m cable metal sensor, it is perfect for use in refrigerator, aquarium tank, fish tank, pet cage, etc.
  • The metal probe is waterproof, you can just drop it into your fish tank.
  • Manufacture: Decdeal
  • Item Weight: 1.22 ounces
  • Editor's Impressions Of The Decdeal
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Decdeal Final Thoughts

"No complaints."

Was going to get a floater until I saw this magnetic one! One extra battery came with each unit. Now if it falls into a sink full of water, it's not a problem. I bought these for my dwc reservoirs. I have it in both my aquariums now. Sure enough the digital thermometer was way off by 6 degrees! This temperature read a perfect 32 degrees.

Overall Score
4.0


(1 Points)

6. Finest-Filters Waterproof Aquarium Fish Tank Thermometer Digital LED Submersible

Finest-Filters First Impressions

"Close enough I reckon!"

So far, they're all doing their job in my four tanks and I am quite content. This is my first 5 star review out of many many reviews on Amazon. I used these on a number of my aquariums that have discus fish in them. So versatile, I can read the temperatures literally anywhere. In the right situation this magnet thermometer is the best available. This thermometer is spot on accurate. I tested this in a cup crammed full of ice and some water.

  • Finest-Filters Waterproof Aquarium Fish Tank Thermometer Digital LED Submersible
  • You are purchasing a submersible aquarium digital thermometer.
  • These thermometers can be completely submerged in the aquarium to provide an extremely accurate temperature display.
  • This thermometer has a temperature range of 19.9 to 70 degrees Celsius.
  • Suitable for salt water and fresh water aquariums, reptiles and green houses.
  • Complete with batteries.
  • Manufacture: Finest-Filters
  • Editor's Impressions Of The Finest-Filters
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Finest-Filters Final Thoughts

"Disappointed."

I use a small flashlight if I don't want to brighten the area. This doesn't bother me as it ws so cheap. I guess these units do not like saltwater. It worked great and I highly recommend it! If the digital display starts to get dim, it's time for a new battery. It's kind of difficult to hide and keep out of the way. I used these to raise chicks, and in my parrot cages.

Overall Score
3.0


(2 Points)

7. Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature

User Ratings: 74 3

Zacro FBA_ZDT1-AUX-1 First Impressions

"I like this."

I have kept aquariums for about 45 years. For something so cheap, they are working remarkably well. So the extra units will always come in handy. One of my aquariums is glass, and the other two are plastic. It works equally well on all of them. Personally I do not mind the way it looks in my aquarium. My only complaint is that they tend to be a one time use.

  • Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature
  • Small volume, large function: The size of thermometer is 2.17 x 1.46 in. Our thermometer is suitable for different water types such as fresh water, tap water, salty water, marine water and etc.
  • Convenient: You can choose seither Fahrenheit or Celsius according to your need. What's more, each thermometer is equipped with a LR44 battery.
  • Show clearly temperature: You can read the temperature data clearly in the LCD screen. Please note that the thermometer reading has about 1 degree deviation.
  • Easy to use: Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water).
  • Temperature range: -50 degree Celsius~ + 70 degree Celsius; Operating temperature: -10 degree Celsius~ +50 degree Celsius.
  • Manufacture: Zacro
  • Editor's Impressions Of The Zacro FBA_ZDT1-AUX-1
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Zacro FBA_ZDT1-AUX-1 Final Thoughts

"7 reading."

The lid is textured aluminum, and the suction cups don't stick to that. This company is taking the long term view of how to do business right. 2 deg, if it was 32, it would be a SOLID block of ice. I recommend gluing the suction cups in place where needed for long-term installation. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. For the price I'll probably end up putting these in all of my aquariums. All were Close enough for a fish tank and other uses.

Overall Score
4.5


(4472 Points)

8. AquaTop ATP Thermometer Submersible

User Ratings: 28 16

AquaTop DTG-15 First Impressions

"Very accurate."

So, in those cases, I find it easier to simply replace it. I have always had trouble reading the color temp. So far, they're all doing their job in my four tanks and I am quite content. For something so cheap, they are working remarkably well. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. I used to have a large hang in the side tank that you couldn't miss. My only complaint is that they tend to be a one time use.

  • AquaTop ATP Thermometer Submersible
  • The sleek, compact designs provide easy placement, making the DTG-15 and dtg-25 the perfect choice for aquariums of all sizes.
  • The digital thermometers are accurate to +/- 2 degrees Fahrenheit.
  • The DTG-15 is fully submersible and has a suction cup mount.
  • The dtg-25 has an adhesive back for easy installation and must be mounted externally.
  • Suction Cup mount
  • Manufacture: Aquatop
  • Product Dimensions: 8 x 3 x 2 inches; 1.41 Ounces
  • Editor's Impressions Of The AquaTop DTG-15
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

AquaTop DTG-15 Final Thoughts

"I opened the first three."

I was using one of those ubiquitous cheap digital thermometers on Amazon. These digital thermometers are great and there is no guesswork involved. You dont HAVE to stick the display onto your tank. Works well in my betta tank, but provide a couple hours for it to read temp changes. I can't say which is the most accurate and don't really care. So much easier than the ones that hang on the inside. This temperature read a perfect 32 degrees.

Overall Score
3.1


(6 Points)

9. DWSFADA Waterproof Digital Thermometer for Pets,Animal Electronic Thermometer Care Tool Fast Reading...

User Ratings: 68 15

DWSFADA L052579L5U First Impressions

"Would buy again."

Was going to get a floater until I saw this magnetic one! I have it in both my aquariums now. I can't say which is the most accurate and don't really care. So far I've been very thrilled with these. This company is taking the long term view of how to do business right. I ordered this guy and it was 6 degrees hotter than the digital! Since adding one of these, it has been much easier to monitor the temp of my tanks.

  • DWSFADA Waterproof Digital Thermometer for Pets,Animal Electronic Thermometer Care Tool Fast Reading Pet Thermometer 32-43 Degree Veterinary Temperature Indicator in 3-5 Seconds
  • Material: ABS,Size:Approx. 13.5in—2cm/5.3in—0.79inch. Pet temperature readings in celsius.
  • The backlight is very useful and beautiful making everything crystal clear
  • Very suitable for pigs, cattle, cattle, goats, etc
  • Insert the thermometer into the rectum of the animal 5-8 cm and press the on/off button.Start measuring when you hear a click. The measurement ends when a continuous beep is heard
  • If you have any problems with our digital thermometer, please feel free to contact us and we will reply you within 24 hours
  • Manufacture: DWSFADA
  • Product Dimensions: 5.51 x 0.98 x 0.39 inches; 0.95 Ounces
  • Editor's Impressions Of The DWSFADA L052579L5U
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

DWSFADA L052579L5U Final Thoughts

"2-degrees."

Very impressed, I have now had them in used for a month so far. I have to admit I had two reasons for buying six. They reviewed the packaging or shipping by saying it arrived broken. Ambient room temperature measures 72. I needed a solution that was not breakable and these do the trick! And I just really started to doubt it. Then she followed up again on that, asking if they had arrived and were okay.

Overall Score
4.1


(8 Points)

10. 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)

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