Editor's Choice - Our Favorite Qguai Aquarium Thermometers

1. Qguai Aquarium Thermometer, C/F Switch LCD Digital Fish Tank Thermometer with Large Clear Screen, Mo...

User Ratings: 70 6

Qguai First Impressions

"Very easy to read."

I have always had trouble reading the color temp. It is about 6 inches in length and roughly an inch wide. It is easy to use and install it'disappears' in your tank it is so unobtrusive. The display can be set to Fahrenheit or Celsius. So much easier than the ones that hang on the inside. So the extra units will always come in handy. The temperature fluctuated a lot with it.

  • Qguai Aquarium Thermometer, C/F Switch LCD Digital Fish Tank Thermometer with Large Clear Screen, Monitor Water Terrarium Temperature, No Messy Wires in Your Saltwater Freshwater and Reef Aquarium.
  • Simple and Sleek Aquarium Thermometer: Digital number display on large clear screen ensures you to read current temperature quickly and accurately without any blind zone. no probe or messy wires in water reduce electronic component aging problem.
  • Accurately monitor water temperature in Fahrenheit or Celsius: Just press “up” or “down” to switch C / F, and this temperature thermometer will display reading from 0C to 70C / 32F - 158F with precision backside temperature probe stick on the fish tank, it is accurate to 0.1.
  • Easy to set up safe zone: This Self-adhensive fish tank thermometer is powered by CR2032 (included), you just need to tear down the film and stick it to the outside of your fish tank. Specially made insulative tape is easy to remove and will not leave any stain on your fish tank.
  • Wide application: Suitable for different water types such as fresh water, tap water, salt water, marine water, can be used as terrarium thermometer to monitor the living temperature for reptile such as lizard, turtle.
  • Our Fish Aquarium Thermometer is backed by 6 Month Warranty. Contact us if you have any problem.
  • Manufacture: Qguai
  • Batteries: 2 Product Specific batteries required. (included)
  • Editor's Impressions Of The Qguai
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='3.8']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='4']

Qguai Final Thoughts

"Would buy again."

Ordered three of these and they do the job. This temperature read a perfect 32 degrees. Good cheap accurate aquarium thermometer. The display can be set to Fahrenheit or Celsius. I had my heater set at 73-degrees and the thermometers showed 74. However, Lucy at Zacro read this review and emailed me. All were Close enough for a fish tank and other uses.

Overall Score
4.4

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

2. Amer Thermal Instruments Liquid Crystal Vertical Aquarium Thermometer, Small

User Ratings: 73 7

Amer Thermal Instruments BC002021 First Impressions

"Holds a steady 1."

Then is started to give a low reading, and it is not reading the correct temperature. The digital display itself is easy to read at a glance. 6 in a pack, extra batteries, easy set up, great price. I've checked it against two other thermometers that are accurate. One of my aquariums is glass, and the other two are plastic. Place it on your aquarium and you are good to go. My poor fish was in 86 degrees water for a month.

  • Amer Thermal Instruments Liquid Crystal Vertical Aquarium Thermometer, Small
  • Liquid Crystal Vertical Aquarium Thermometer. Miscellaneous Aquarium
  • Manufacturer: AMERICAN THERMAL
  • Manufacturer part number: A-1003
  • Manufacture: Unique Cell Distributors LLC
  • Product Dimensions: 4 x 0.5 x 7 inches; 0.08 Ounces
  • Editor's Impressions Of The Amer Thermal Instruments BC002021
  • Thermometer Accuracy [star rating='4.7']
  • Quality [star rating='4.4']
  • Value For Money [star rating='5']
  • Affordability [star rating='3.4']

Amer Thermal Instruments BC002021 Final Thoughts

"Overall a great buy."

And is easily hidden behind a plant. I came here to give this product a positive review. At least in the first 3 months of use. Excellent working for our bearded dragon tank. The digital display itself is easy to read at a glance. Simple fix, you adjust the thermometer within the suction cup and VIOLA! So much so that I purchased a second set of 6.

Overall Score
4.4

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

3. 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 [star rating='3.5']
  • Quality [star rating='4.5']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='3.8']

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

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

4. RISERPO LCD Digital Aquarium Thermometer for Fish Tank, Marine, Reptiles, Insects, Lizard, Terrarium...

User Ratings: 63 7

RISEPRO TM-4 First Impressions

"So glad i got these!"

So this is the extreme end of the high temperature range. So far, they're all doing their job in my four tanks and I am quite content. I think the people who said the suction cup broke. Was going to get a floater until I saw this magnetic one! The suction works for a month at a time- in pool and hot tub circulation. I just wrote it off as a minor loss. For something so cheap, they are working remarkably well.

  • RISERPO LCD Digital Aquarium Thermometer for Fish Tank, Marine, Reptiles, Insects, Lizard, Terrarium, Bath and etc
  • EASY TO SETUP – RISEPRO® aquarium thermometer can easily be set in minutes. Simple mount main display unit over the tank! And place the sensor probe inside the water!
  • WIDE RANGE & ACCURATE – Measure -58.0 to 158.0 degree Fahrenhit (-50.0 to 70.0 degree Celsius) with accuracy +/- 1 degree Celsius
  • TEMPERAURE UNITS – Easy switch between degree Celsius and Fahrenhit
  • WIDE VARIETY OF AQUARIUM AND WATER TANKS – Suitable for different water types such as fresh water, tap water, salty water, marine water and etc.
  • GREAT FOR REPTILE – Suitable for monitoring the living temperature for reptile such as lizard, turtle etc.
  • LCD display with remote submersible sensor probe
  • Compact design with 2 suction cup mounts
  • Switch between °C and °F
  • Manufacture: RISEPRO
  • Product Dimensions: 2.3 x 0.6 x 1.5 inches; 0.8 Ounces
  • Batteries: 1 Lithium ion batteries required. (included)
  • Editor's Impressions Of The RISEPRO TM-4
  • Thermometer Accuracy [star rating='3.4']
  • Quality [star rating='3.6']
  • Value For Money [star rating='4.2']
  • Affordability [star rating='5']

RISEPRO TM-4 Final Thoughts

"These are great!"

In the right situation this magnet thermometer is the best available. I guess these units do not like saltwater. This thermometer is spot on accurate. Place it on your aquarium and you are good to go. So versatile, I can read the temperatures literally anywhere. I used to have a large hang in the side tank that you couldn't miss. I don't think they are backlit but for the price they are still nice.

Overall Score
4.3

[star rating="4.3"]
(284 Points)

5. DaToo Aquarium Thermometer with Sucker, Second Generation (Update), 1 Yr Warranty

User Ratings: 45 25

DaToo First Impressions

"Would buy again."

So, in those cases, I find it easier to simply replace it. My only complaint is that they tend to be a one time use. My only complaint is that they tend to be a one time use. And for the price you cant beat it. I guess these units do not like saltwater. I recommend gluing the suction cups in place where needed for long-term installation. You dont HAVE to stick the display onto your tank.

  • DaToo Aquarium Thermometer with Sucker, Second Generation (Update), 1 Yr Warranty
  • SIMPLE DESIGN - The DaToo Aquarium Thermometer is an attractive but simple designed unit with no over-complicated controls. The unit itself is blue, and features a clear plastic trim around the edges.
  • WATERPROOF - The aquarium thermometer is completely waterproof, you can put it in the fish tank, real-time monitoring of water temperature
  • VERY SIMPLE TO OPERATE - No instructions necessary. This is the simplest aquarium thermometer on the market with no buttons to operate.
  • SUCTION PAD FOR EASE OF PLACEMENT - Just find the best spot in the fish tank, then attach the unit with the small suction pad which will keep the thermometer in place until removal is required.
  • WIDE RANGE - The temperature range is from -58°F to 158°F allowing you to use this aquarium thermometer in the majority of temperature conditions.
  • Manufacture: DaToo
  • Editor's Impressions Of The DaToo
  • Thermometer Accuracy [star rating='3.7']
  • Quality [star rating='3']
  • Value For Money [star rating='3.5']
  • Affordability [star rating='3.7']

DaToo Final Thoughts

"This is perfect."

The extra batteries where very much appreciated and came in handy. 6 inch long Bala Sharks that are known to be very unruly and boisterous. I have to admit I had two reasons for buying six. I am extremely pleased with this product. I have mine on my 60 gallon cube marine tank. Then is started to give a low reading, and it is not reading the correct temperature. 82 PER THERMOMETER with battery included.

Overall Score
3.5

[star rating="3.5"]
(151 Points)

6. 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 [star rating='5']
  • Quality [star rating='4.7']
  • Value For Money [star rating='3.6']
  • Affordability [star rating='4']

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

[star rating="4.5"]
(4472 Points)

7. Digital Display Thermometer - Aquarium, Terrarium, Fish Tank - Fahrenheit & Celsius

User Ratings: 34

Invert Aquatics First Impressions

"Very accurate."

These digital thermometers are great and there is no guesswork involved. This is my first 5 star review out of many many reviews on Amazon. I think the people who said the suction cup broke. I have this thermometer on all my tanks. You can not swivle the thermometer to face a certain way. Sure enough the digital thermometer was way off by 6 degrees! For something so cheap, they are working remarkably well.

  • Digital Display Thermometer - Aquarium, Terrarium, Fish Tank - Fahrenheit & Celsius
  • Easy to read Digital Display can be set to Fahrenheit or Celsius (Unit is 2 1/4" x 1 1/2")
  • Battery Included, 2 Suction Cups Included for easy Mounting, 37" Long Probe Line
  • Accurate and Fast Readings of your Aquarium or Terrarium
  • Submerge only the probe into water (Display remains dry on outside of tank)
  • Ranges from -58 Degrees Fahrenheit to 158 Degrees Fahrenheit
  • Manufacture: Invert Aquatics
  • Batteries: 1 Unknown batteries required. (included)
  • Editor's Impressions Of The Invert Aquatics
  • Thermometer Accuracy [star rating='3.9']
  • Quality [star rating='4.1']
  • Value For Money [star rating='4']
  • Affordability [star rating='3.3']

Invert Aquatics Final Thoughts

"Doing the math."

We are using them to measure various temperatures inside and outside of a motorhome. In the right situation this magnet thermometer is the best available. Water tested with Autidefy brand for two hours. I can't say which is the most accurate and don't really care. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. 89 I could buy Six Thermometers with Six included batteries. I bent it a little bit and when I put it back it was perfectly fine.

Overall Score
4.0

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

8. 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)

9. VIVOSUN 1-Pack LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature with Suction C...

User Ratings: 73 3

VIVOSUN First Impressions

"Fish and me happy."

The display can be set to Fahrenheit or Celsius. I have kept aquariums for about 45 years. The plastic from the suction cup quickly turned from a clear to a milky white. My poor fish was in 86 degrees water for a month. Very accurate, have checked it with other thermometers as well. I was using one of those ubiquitous cheap digital thermometers on Amazon. Put them all in the same tank and they read very close to each other.

  • VIVOSUN 1-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 78.74 inch (2 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='3.8']
  • Quality [star rating='5']
  • Value For Money [star rating='4']
  • Affordability [star rating='5']

VIVOSUN Final Thoughts

"So we are ordering more."

He was moving slow in the winter and we realized he needed a heater! Who knows, whatever it was, it was revolting! I removed the batteries of the units I wasn't using right away. I used to have a large hang in the side tank that you couldn't miss. 49 thermometer that is 100% accurate. At least in the first 3 months of use. The temperature fluctuated a lot with it.

Overall Score
4.6

[star rating="4.6"]
(1062 Points)

10. Water & Wood Aquarium Fishbowl Dual Scale Thermometer Sticker Strip 2 in 1

User Ratings: 48

Waterwood First Impressions

"Not just for aquariums!"

And for the price you cant beat it. The display can be set to Fahrenheit or Celsius. 2 deg, if it was 32, it would be a SOLID block of ice. It will make you wonder why nobody thought of it before. When I set up my newest tank I will be getting another one of these. I bought these for my dwc reservoirs. I don't think i'll ever be able to trust a digital thermometer again.

  • Water & Wood Aquarium Fishbowl Dual Scale Thermometer Sticker Strip 2 in 1
  • Aquarium Fishbowl Dual Scale Thermometer Sticker Strip 2 in 1
  • New product with high quality
  • Manufacture: Water & Wood
  • Editor's Impressions Of The Waterwood
  • Thermometer Accuracy [star rating='3.9']
  • Quality [star rating='4.7']
  • Value For Money [star rating='3.2']
  • Affordability [star rating='4.5']

Waterwood Final Thoughts

"Which is good."

I got the second one as a bonus that I'm now using in my old tank. I'm pretty sure those reviewers have acrylic tanks. It works equally well on all of them. SIX Digital Thermometers with SIX batteries INCLUDED working so well. 49 thermometer that is 100% accurate. For the price I'll probably end up putting these in all of my aquariums. I can't say which is the most accurate and don't really care.

Overall Score
4.0

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

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