Editor's Choice - Our Favorite BOYU Aquarium Thermometers

1. BOYU BT-01 Glass Thermometer for Aquarium

User Ratings: 55 20

BOYU BT-01 First Impressions

"LOVE these thermometers."

One being a very expensive digital. You can use the thermometer with or without the plastic suction cup. So far, they're all doing their job in my four tanks and I am quite content. I have to admit I had two reasons for buying six. So far I've been very thrilled with these. This doesn't bother me as it ws so cheap. However, Lucy at Zacro read this review and emailed me.

  • BOYU BT-01 Glass Thermometer for Aquarium
  • Easy-to-read floating thermometer with suction cups
  • Includes a safety zone indicator
  • Ensures your aquarium is at a proper temperature
  • Celsius or Fahrenheit options
  • Manufacture: Tin Tin Trading Inc.
  • Product Dimensions: 1 x 1 x 4.5 inches; 0.64 Ounces
  • Editor's Impressions Of The BOYU BT-01
  • Thermometer Accuracy [star rating='4.4']
  • Quality [star rating='3.8']
  • Value For Money [star rating='3.4']
  • Affordability [star rating='3.7']

BOYU BT-01 Final Thoughts

"Very easy to read."

6 in a pack, extra batteries, easy set up, great price. Ambient room temperature measures 72. If the digital display starts to get dim, it's time for a new battery. I've checked it against two other thermometers that are accurate. A bit large for anything smaller than 5 gallons, but that's to be expected. The temperature fluctuated a lot with it. One being a very expensive digital.

Overall Score
3.7

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

2. 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 [star rating='4']
  • Quality [star rating='2.9']
  • Value For Money [star rating='3.9']
  • Affordability [star rating='3.8']

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

[star rating="3.9"]
(138 Points)

3. Fenleo Aquarium LCD Digital Thermometer Fish Tank Water Terrarium Temperature

Fenleo Aquarium First Impressions

"Works perfect."

It's kind of difficult to hide and keep out of the way. One extra battery came with each unit. The units each had a battery in place and situated for immediate use. It will make you wonder why nobody thought of it before. My only complaint is that they tend to be a one time use. 6 inch long Bala Sharks that are known to be very unruly and boisterous. 2 deg, if it was 32, it would be a SOLID block of ice.

  • Fenleo Aquarium LCD Digital Thermometer Fish Tank Water Terrarium Temperature
  • ♥Large, easy to read LCD display. Compact design for discrete use
  • ♥Temperature range -50 degree Celsius~ + 110 degree Celsius; Cable length: approx. 3.3 feet
  • ♥Powered by one LR44 button cell (included)
  • ♥Application: Aquarium, Indoor, Refrigerator, Human Body, Car, CPU Heat Diffuser
  • ♥Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water)
  • Manufacture: Lingsun Tech
  • Editor's Impressions Of The Fenleo Aquarium
  • Thermometer Accuracy [star rating='3.7']
  • Quality [star rating='3.5']
  • Value For Money [star rating='4.5']
  • Affordability [star rating='5']

Fenleo Aquarium Final Thoughts

"6 tenths of a degree."

He acted aggressively towards it and so I ultimate ended up removing it due to that. My poor fish was in 86 degrees water for a month. The digital display is nice and small as well. In the right situation this magnet thermometer is the best available. I have this thermometer on all my tanks. I ordered this guy and it was 6 degrees hotter than the digital! Was going to get a floater until I saw this magnetic one!

Overall Score
4.0

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

4. uxcell Temperature Gauge Aquarium Thermometer Celsius with Probe for Fish Tank 3pcs

User Ratings: 69

uxcell First Impressions

"Currently maintains a 76."

Then is started to give a low reading, and it is not reading the correct temperature. Water tested with Autidefy brand for two hours. One of my aquariums is glass, and the other two are plastic. 6 in a pack, extra batteries, easy set up, great price. Personally I do not mind the way it looks in my aquarium. So this is the extreme end of the high temperature range. Now that the chickens are grown, I have one out in the coop as well.

  • uxcell Temperature Gauge Aquarium Thermometer Celsius with Probe for Fish Tank 3pcs
  • Temperature range: -50℃ ~ 110℃ (-58°F ~ + 158°F)
  • Designed to be embedded or can be surface mounted
  • Battery Operated (included) (Aprox 2 year battery life)
  • Remote wired probe can read temperature up to 3.3 feet away
  • Perfect for use in refrigerator, aquarium tank, fish tank, pet cage, bedroom or any other place that requires monitoring of temperature.
  • Manufacture: Uxcell
  • Part Number: A19010400ux0395
  • Item Weight: 3.45 ounces
  • Size: 3 Piece
  • Power Source: Battery Powered
  • Batteries Required?: No
  • Editor's Impressions Of The uxcell
  • Thermometer Accuracy [star rating='3.9']
  • Quality [star rating='4']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='4.8']

uxcell Final Thoughts

"All you need."

It is my opinion that everyone should have these that are in the Aquarium Hobby. I read some of the 1 star reviews and most of them are not about the product. My only complaint is that they tend to be a one time use. This company is taking the long term view of how to do business right. SIX Digital Thermometers with SIX batteries INCLUDED working so well. Far more accurate than the usual small glass ones or external LCD strips. I have this thermometer on all my tanks.

Overall Score
4.1

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

5. 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)

6. KORDON #37444 Malachite for Aquarium, 4-Ounce, Green

User Ratings: 74 4

Kordon 479042 First Impressions

"Just received it today."

And for the price you cant beat it. 6F all six took about three minutes to read between 88. I removed the batteries of the units I wasn't using right away. It works equally well on all of them. My 50+ eyes cannot read a regular tank thermometer without squinting. I read some of the 1 star reviews and most of them are not about the product. It is easy to use and install it'disappears' in your tank it is so unobtrusive.

  • KORDON #37444 Malachite for Aquarium, 4-Ounce, Green
  • Kordon malachite green 4oz
  • Malachite green is also effective against common external fungi infections of fishes and eggs
  • Malachite green is an effective medication used for the control of various external parasites
  • Manufacture: TopDawg Pet Supply
  • Product Dimensions: 0.02 x 0.02 x 0.02 inches; 0.32 Ounces
  • Editor's Impressions Of The Kordon 479042
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='4.7']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

Kordon 479042 Final Thoughts

"This is perfect."

You dont HAVE to stick the display onto your tank. 82 PER THERMOMETER with battery included. I did have a problem with one in my first pack of 6. Set all six probes up in a terrarium with a constant temp of 88. My only complaint is that they tend to be a one time use. I have always had trouble reading the color temp. Was going to get a floater until I saw this magnetic one!

Overall Score
4.5

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

7. SunGrow Digital pH and TDS Meter Set, Accurate Readings, Easy to Read LCD Screen, Monitor Aquarium, ...

User Ratings: 57 6

SunGrow First Impressions

"Great product!"

This thermometer is spot on accurate. 50 thermometers, reads much easier and no suction cup residue, also looks better. I just wrote it off as a minor loss. Checked with temp gun and the terrarium was on target at 88. I bent it a little bit and when I put it back it was perfectly fine. I think the people who said the suction cup broke. Set all six probes up in a terrarium with a constant temp of 88.

  • SunGrow Digital pH and TDS Meter Set, Accurate Readings, Easy to Read LCD Screen, Monitor Aquarium, Fruit, Tap Water, Pool Water, 4 LR44 Batteries Included
  • ✔ TWO-IN-ONE SOLUTION --- This Ph and TDS combo meter by SunGrow will give you the best of both worlds in one device. This SunGrow pack includes electrodes and components needed to test both the pH and TDS of any water solution. It’s easy to use and less equipment to deal with than two separate devices.
  • ✔ ENERGY-SAVING, LIGHTWEIGHT AND PORTABLE DEVICES--- This PH and TDS meter has a handheld pen-type design that weighs barely 1.7 oz making it lightweight and portable. It comes with a handy case that you can easily slip into a backpack or work bag if you need to bring it with you. The meter shuts off automatically after 10-minutes of non-use to conserve batteries. (BATTERIES INCLUDED)
  • ✔ CALIBRATION SCREWDRIVER INCLUDED --- These meters have been factory-calibrated and are designed to stay consistent. However, if you need to recalibrate your meter from time to time or you want to calibrate for different applications, you can use the screwdriver calibration tool included for continued accurate readings of your water. The TDS meter is most accurate when calibrated as close as possible to the sample to be tested.
  • ✔ HIGHLY ACCURATE READINGS --- This pH and TDS professional level water test meter precisely measures and monitors the levels in your aquarium or other liquid solutions. The SunGrow pH and TDS meter will give you extremely accurate readings of the ph levels and Total Dissolved Solid within ± 2% range.
  • ✔ MULTI-USE MEASURING TOOL--- This little tool is a valuable instrument for keeping a tab on various bodies of water. You can use it to make sure the level in your freshwater or saltwater aquarium is optimal for your fish, test water in a laboratory or for the hydroponically grown vegetables. You can also test the swimming pool, tap water, and spa water.
  • Manufacture: Luffy Pets Collection
  • Editor's Impressions Of The SunGrow
  • Thermometer Accuracy [star rating='3.7']
  • Quality [star rating='4.6']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

SunGrow Final Thoughts

"Easy to setup in tank."

When I set up my newest tank I will be getting another one of these. My 50+ eyes cannot read a regular tank thermometer without squinting. Love it, it's easy to read and keeps an accurate temp. I used to have a large hang in the side tank that you couldn't miss. It will make you wonder why nobody thought of it before. Bought the two pack of thermometers. Place it on your aquarium and you are good to go.

Overall Score
4.2

[star rating="4.2"]
(44 Points)

8. NITRIP Digital Aquarium Thermometer, DC16 LCD Waterproof Temperature Thermometer for Fish Tank

Nitrip First Impressions

"2-degrees."

A battery can last you up to six months, I'd say, but expect more like three. This doesn't bother me as it ws so cheap. Since it is a mercury thermometer, it is very accurate. The display can be set to Fahrenheit or Celsius. So this is the extreme end of the high temperature range. For something so cheap, they are working remarkably well. So much easier than the ones that hang on the inside.

  • NITRIP Digital Aquarium Thermometer, DC16 LCD Waterproof Temperature Thermometer for Fish Tank
  • With a Large LCD screen: easy to read the temperature at a glance.
  • Very precise: this thermometer is accurate enough to create readings within 0.1 degree.
  • No sensor cable needed, simply attaches to the interior of your aquarium with the suction cup.
  • High and low temperature automatic alarm: default high temperature 28℃, low temperature of 18℃.
  • Wireless with integrated probe and waterproof design, perfect for fish tank or other place.
  • Manufacture: NITRIP
  • Product Dimensions: 1.97 x 1.97 x 1.97 inches; 1.2 Ounces
  • Editor's Impressions Of The Nitrip
  • Thermometer Accuracy [star rating='3.6']
  • Quality [star rating='2.7']
  • Value For Money [star rating='3.6']
  • Affordability [star rating='2.7']

Nitrip Final Thoughts

"I like these."

I bent it a little bit and when I put it back it was perfectly fine. I don't think i'll ever be able to trust a digital thermometer again. One of my aquariums is glass, and the other two are plastic. So much so that I purchased a second set of 6. I have it in both my aquariums now. I used to have a large hang in the side tank that you couldn't miss. I find that the temps are accurate, and this product gives added peace of mind.

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. American Thermal Liquid Crystal Aquarium Thermometer Vertical Small

User Ratings: 72 7

Amer Thermal Instruments BC002021 First Impressions

"Perhaps it's my fault."

I have to admit I had two reasons for buying six. It is always where yo last put it and it is very easy to see and read. The units each had a battery in place and situated for immediate use. These things are useful for a lot besides pet husbandry, too. This thermometer is spot on accurate. The units each had a battery in place and situated for immediate use. 6 in a pack, extra batteries, easy set up, great price.

  • American Thermal Liquid Crystal Aquarium Thermometer Vertical Small
  • Know your aquarium's temperature at a glance
  • Easy-to-read and accurate thermometer mounts on outside of your aquarium
  • Unbreakable, non-corrosive, and non-toxic
  • Fahrenheit scale
  • Manufacture: Amer Thermal Instruments
  • Editor's Impressions Of The Amer Thermal Instruments BC002021
  • Thermometer Accuracy [star rating='4.3']
  • Quality [star rating='3.7']
  • Value For Money [star rating='4.6']
  • Affordability [star rating='3.5']

Amer Thermal Instruments BC002021 Final Thoughts

"Which is good."

You can glue, tape or simply cover the cords in the tank to keep them discreet. 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! The digital display itself is easy to read at a glance. I can't say which is the most accurate and don't really care. In the right situation this magnet thermometer is the best available. So versatile, I can read the temperatures literally anywhere.

Overall Score
4.4

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

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