10 Best Thermometers For Aquarium Reviews (2022 Guide)


If you’re a pet fish owner, you’re already well aware of how important it is to have the best aquarium thermometer installed in your aquarium. If you don’t give your fish a proper environment to live in, you may be risking your fish’s life and well being. So, to help you find the best thermometer for aquarium and to help you keep your tank functioning at the optimum environment, we’ve compiled a guide based on aquarium thermometer reviews.

That’s right, if you are a current fish owner or are looking to buy some sea life creatures for your water tank, you’re going to need to install the best aquarium thermometer. Not only are aquatic thermometers important to keeping track of the water temperature for your fish, but it will also keep any plants you have in the tank alive as well. But, what is a good thermometer? What is the best thermometer? Just with any other type of plant or animal, you’re going to want to provide the correct temperature. This will change depending on what type of creatures and plant life you choose to live in your tank. Please do your research before you decide to buy any sea life because different ones will need different types of care.

When choosing the best aquarium thermometer, you may want to focus on one specifically designed to track the temperature in aquarium tanks. The reason for this is because other types of thermometers are not created to withstand constant exposure to water. They are also harder to clip into the tank and they are usually hard to read unless you pick it up out of the tank, which will probably startle your fish. So, choosing one that is specifically designed for a fish tank is going to be the best investment for you.

So, how this article works is that we’ve done extensive research on helping you find the best aquarium thermometers on the market. All of our information is based on reviews from verified purchased items and reviews. First, we will run you through a quick comparison chart, that way you’ll get a feel for what features you need to look for. Then we will share with you the top aquarium thermometers on the market today, and lastly, we will then have an FAQ where we will answer common questions you may have a fish over. By the end of this article, you will have all the information you’ll need to know when it comes to buying, selecting, and keeping your fish in the best possible health.

Best Aquarium Thermometer 2019 Buying Guide

The following part of the article is a short buying guide that will provide you with basically everything you need to get started when buying the best aquarium thermometer. We will give you all the prerequisites so that you can take the best buying decision! Let’s move on.

What’s The Ideal Aquarium Temperature?

You may be wondered, “what temperature should my aquarium be”, “what temperature should a freshwater aquarium be?”. The ideal temperature of an aquarium tank is going to depend on a few important factors. First of all, if you own tropical fish, you’re going to need to keep the tank warmer. If you own sea creatures such as crab or crustaceans, you’re going to need to keep the tank cooler. An ideal range that benefits all creatures is going to be between the temperatures range of 76 degrees Fahrenheit to 80 degrees Fahrenheit. Some species will require more, and others less, so many sure you know what temperature should an aquarium be specific tank needs to be to keep your fish in optimal health.

Saltwater Aquarium Temperature

You may be asking yourself, “what temperature should I keep my saltwater aquarium at?. Saltwater fish need to be kept at a warmer temperature or else you are risking their death. Saltwater fish should always be kept in a warm environment, as they are designed to be living in warmer climates. The ideal temperature for tropical fish is an aquarium that is set to be 78-degree Fahrenheit to 82 degrees Fahrenheit.

Freshwater Aquarium Temperature

Freshwater fish need to be placed in a tank temperature that is a little colder than most other fishes. This is because warmer temperatures can actually be harmful to their bodies and increase their metabolism and shorten their lifespan significantly. The best temperature for aquariums to keep for tropical fish at is anywhere from 75 degrees Fahrenheit to 80 degrees Fahrenheit. The water temperature for freshwater aquariums should be kept around these temperatures. It’s important that the freshwater aquarium water temperature does not drop below or go any higher, as this could cause your fish to die.

Tropical Aquarium Temperature

Tropical fish need to be kept at water temperatures that are typically warmer than most. This is because they live in a climate that is naturally warm. A good range to keep your aquarium tank at is between 76 degrees Fahrenheit to 80 degrees Fahrenheit.

What Are Benefits Of Having An THE BEST Aquarium Thermometer?

What is the best aquarium thermometer? What aquarium thermometer are most accurate? Having the best aquarium thermometer in your fish tank ensures that your fish are being kept in an environment where their lives are not being put at risk. Temperatures that fall above or below your fishes ideal living temperature could ultimately put your fish at risk for an increased metabolism and shorten their lifespan.

It may not seem like a big deal, however, the fish notice the few rise or drops in temperature instantly. Imagine if you used to live at a certain temperature and all of a sudden you were thrown into a different environment without the necessities to keep you warmer or colder? Fish work the exact same way. So, owning the best aquarium thermometer and educating yourself will help answer questions like “what thermometer is most accurate?”, “why do I need to monitor the temperatures?”, and “where do you even put a thermometer?”.

Thermometer Types

When you’re looking to buy a thermometer for your aquarium, you may want to think about different types of best aquarium thermometers you’d like to have. Sometimes certain ones work better than others, so make sure you’re aware of the different fish thermometers that are available on the market. You may be wondering where to put the thermometer, and what kind of thermometer measures water temperature best. Keep reading and you’ll learn about all the different types;

LCD Stick-on Thermometers

The stick on thermometers are what most people find the ideal type of best aquarium thermometer. It functions by being stuck on the side of the tank and it will display the temperature by color. They are a relatively cheap option when it comes to the best aquarium thermometers and can be a good option if you’re not needing to check for specific temperatures. The only issue is that they can be hard to read and once you stick them on they usually can’t be moved. They are also not as accurate as other models on the market. But overall, if you’re not looking for exact temperatures this could be a good option for you.

Standing Or Floating Aquarium Thermometers?

These are analog thermometers which use the same mechanisms as the ones you may have to measure the temperature in your home. They usually float around the tank or are secured to the walls or the bottom of the tank. You can tell what temperature the water is by checking the temperature from the red bar.

These thermometers are a good choice for people who need an accurate reading of your tank temperature. Most of the best aquarium thermometers will show a “green bar” which is the “safe zone” you should keep your tank temperature in. They’re not expensive, and usually will last a lifetime. The only issue with this type of thermometer is that fish may damage the thermometer, or a plastic one may break after being used for too long.

Perks of Digital Aquarium Thermometers

How does a digital aquarium thermometer work? Are digital aquarium thermometers accurate? These thermometers usually are smaller and have an LCD display which sits on top of the tank. They will have a temperature probe which should be placed into the water and it will measure the temperature in the water. They are a good choice as they are very accurate, they can be changed from Celsius to Fahrenheit, and they are very easy to read.

The best digital thermometers are long-lasting and are capable of being durable and are not easily damaged or broken. The only downside that you should be aware of is that they can be more expensive than other types of thermometers on the market. We will suggest that you stay clear of plastic ones, or ones that seem to be too low of a price, as they may not be as accurate as other models at reading the temperature. The only big downside is that you will eventually have to replace the batteries every once in a while.

What Are Benefits Of Having The Best Digital Aquarium Thermometer?

There aren’t really that many benefits of having an aquarium thermometer, however, we highly suggest that you need one to make sure that your tank is providing your fish with a healthy temperature and environment that won’t damage their health. By having a thermometer installed in your tank, you’ll be able to monitor the temperature and adjust the tank temperature to the need of your type of species of fish. Always do research on what type of fish you own and what their ideal water temperature is.

Ease of Operation

Best aquarium thermometers are not hard to operate at all. The only time installation may be complicated will be if you already have the fish in the tank and do not have a separate tank to put them in while installing. Most of the best aquarium thermometers will have an easy to read display, however, not all of them come with this feature. If you get one that only reads by color then it may not be as easy. After you’re done installing, there really isn’t any complications you need to be aware of other than if your thermometer starts to malfunction.

Aquarium Thermometer’s Longevity

Most aquarium thermometers will last a few years, however, there is still the chance that something will go wrong while you are using it. Always make sure to check if the thermometer is damaged, as sometimes fish or other sea life will bump against it. You can prevent this by buying non-plastic type thermometers. Also, check to see if it is displaying the correct temperature by measuring the temperature with a regular thermometer. Look for signs of cracks, major jumps in temperature, etc.


You also may be wondering about aquarium thermometer accuracy. Most of the best aquarium thermometers are going to be very accurate at displaying the temperature in the tank. You will always want to make sure that the thermometer is reading the temperature of the water and not just the inside air of the tank. If you’re using a normal thermometer it may be off by just a few degrees, and if you’re using a digital water thermometer, they will usually be very accurate. Now, if you decided to get one that displays the right temperature by color, then you may want to consider that these can be extremely vague. So, if your fish happens to need a consistent temperature, get a different type of thermometer, as these can be super inaccurate.

Aquarium Thermometer’s Versatility

Aquarium thermometers can be used for many other types of projects. Other people have noted that you can use the thermometers for potting and planting, reptiles, amphibians, incubators, refrigerators, etc. There are so many uses you can use a thermometer in, basically anything you need to know the temperature of.

Best Aquarium Thermometers Comparison

ProductTempsDisplay TypeExtra FeaturesRating
General Tools AQ150 Aquarium Thermometer-58-158 fahrenheitDigitalMin/Max Memory
High/Low Temp Alarm
4 of 5BUY NOW from Amazon.com
HDE Digital Aquarium Thermometer-50-70 CLCDSuction cups4.1 of 5BUY NOW from Amazon.com
AODE Digital LCD Aquarium Thermometer-10-70 CLCDCompact design4.1 of 5BUY NOW from Amazon.com
Zoo Med Digital Terrarium Thermometer10-140 FDigitalVery Compact Designt4.1 of 5BUY NOW from Amazon.com
CNZ Digital LCD Thermometer for Aquarium-10-140 FLCDCompact4.3 of 5BUY NOW from Amazon.com
Zacro Pack of 2 LCD Digital Aquarium Thermometer-50-70 CLCDLarge display
Suction Cups
4.3 of 5BUY NOW from Amazon.com
Pet Magasin Digital ThermometerN/ALCDLarge display
Monitor temp and humidity
Compact Design
3.6 of 5BUY NOW from Amazon.com
Coralife 00232 Digital ThermometerN/ADigitalSuction Cup
3ft Temp Probe
3.5 of 5BUY NOW from Amazon.com
CoZroom LCD Digital Aquarium Thermometer-50-70 CLCDHigh Accuracy4.3 of 5BUY NOW from Amazon.com
Fluval Wireless Digital ThermometerN/ALCDMeasure Water & Room Temp
Large Screen
3.4 of 5BUY NOW from Amazon.com

1.General Tools AQ150 Aquarium Thermometer Review

General Tools AQ150 best Aquarium Thermometer

The General Tools AQ150 Best Aquarium Thermometer is a great pick for fish owners who want a line-in and a line-out thermometer. It can help monitor the temperature in any marine environment. The thermometer measures temperatures that are very cold to very hot, and will display both remote and ambient temperatures. This thermometer is great for if you want an easy to read display and you need to set your tank to specific temperatures. The thermometer is also CE approved.


  • digital display – fully digit display which shows the temperature.
  • minimum & maximum memory – has memory so you can keep track of which temps you would like your tank to stay at.
  • high & low-temperature alarm – if the temperature of the water starts to drop above or below the limits you set then an automated beeping alarm will go off to let you know.
  • jumbo screen – a giant digital screen that displays the temperature, it’s easy to read from even far away.
  • toggle between ambient/remote sensor – you can change the sound of the sensor.
  • celsius and Fahrenheit – toggle between both c and f degrees.
  • blacklight display – backlight display to help make it easy to read.
  • foldaway stand – a stand that can fold away when you don’t want to use it.


  • Year Lifespan – Many customers enjoy the use of this thermometer, however, many reviews say that it does not last past a year to two.

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2. HDE Digital Aquarium Thermometer Review

HDE Digital Aquarium Thermometer

The HDE Digital Aquarium Thermometer is great for people looking to get a thermometer for either freshwater or saltwater marine life. It helps provide a very safe, healthy, and better habitat for your fish, reptile, or amphibian. The display is large, which makes it ideal for people who need a larger display, and you can partially submerge the probe.


  • 1/2/3 packs – you have the option to buy in these different pack sizes just in case you need more than one because of multiple tanks or larger sized tanks.
  • lcd display – bright display that helps you view the numbers on the screen.
  • large digital display – very large display that way there is no way you can’t see the information on the screen.
  • fahrenheit and Celsius – change between either F or C degree settings.
  • submerge probe – you need to submerge the probe, but not the display.
  • lr44 batteries – comes with replacement batteries as well.


  • Temperature is off – Many people enjoy the thermometer, but some have noticed that it can sometimes be off anywhere from ½ a degree to 4 degrees off. This is usually only after a few months of use, and the older it gets it does have the chance of glitching from time to time.

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3. AODE Digital LCD Aquarium Thermometer Review

AODE Digital LCD Aquarium Thermometer

The AODE Digital LCD Aquarium Thermometer is a perfect pick for anyone who is looking for a very compact and discrete digital thermometer. It’s very easy to read and has a decent sized display that is lit up. You can easily switch between both C and F degrees, and it has simple buttons for operations. You can press PWR for 3 seconds and it will power off the device, which is great if you don’t want to replace the batteries. You do need to submerge the probe into the tank, but do not get the display wet.


  • submerge probe – you need to submerge the probe into the water but not the unit.
  • large display – very large display that makes it easy to read from close and from afar.
  • lcd display – lights up and is easy to read from any position.
  • compact – very small unit but it still has a big display.
  • lraa button cell – lraa batteries are needed.
  • suction cups – suction onto the walls of the tank for easy installation.


  • Suction Cups Give out – After multiple uses people have said that the suction cups will start to deform and will not stick as well to the sides of the tank. This is likely due to old age and frequent uses and also a buildup of residue on the suction cups.

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4. Zoo Med Digital Thermometer Review

Zoo Med Digital Terrarium Thermometer

The Zoo Med Digital Terrarium Thermometer is a very simple and simplistic thermometer that can be used in aquariums, terrariums, and incubators. Use it to keep track of the temperature for your lizards, dragons, snakes, and fish. It includes an external sensor that needs to be placed into the water so that you can get a consistent reading on temperatures. You can change the display from Fahrenheit to Celsius when needed. It has an LCD screen and displays the temperature very easily.


  • external probe – there is an external probe that needs to be placed into the water so that it can track the water temperature.
  • lcd display – a nice lcd display with a decent sized screen.
  • very compact – very small unit and is compact, good for people who don’t want to use up too much space in their tank.


  • Not Backlit or LCD – It’s hard to see the display if you’re not in good lighting, sometimes you will also have to get down eye level to the tank to see the display of temperature.

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5. CNZ Digital LCD Thermometer for Aquarium Review

CNZ Digital LCD Thermometer for Aquarium

The CNZ Digital LCD Thermometer for Aquariums is one of the best picks when you’re looking for packs for multiple tanks. You can buy multiple ones and either save them for backups or use them in larger cages. They are ideal for aquariums and terrariums. There is an easy to read LCD display located on the screen. You can change it from degrees Celsius and Fahrenheit. There are two replaceable batteries included. Enjoy using this thermometer for monitoring any parameters that are essential to reptile and fish health and well being.


  • 1/2/6 pack – you have the option to buy it in different packs, that way you have more than one for multiple tanks.
  • lcd display – nice lcd display, very easy to read and displays nicely.
  • two replaceable batteries – comes with two replaceable batteries when purchased.
  • suction cups – included on the back are suction cups that help for easy installation.


  • Inconsistent Temp – Many people say that their thermometer reads within a 1-2 degree consistency. If you need one that is more accurate then this one isn’t for you. It works well for general use if you’re just trying to monitor a certain temperature range.

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6. Zacro Pack of 2 LCD Digital Aquarium Thermometer Review

Zacro Pack of 2 LCD Digital Aquarium Thermometer

The Zacro Pack of 2 LCD Digital Aquarium Thermometers is a great pick for people who want a very simplistic thermometer that is easy to read but is still compact. It has a submerged probe to help measure water temperature. It’s easy to install and the temperature readings should be within a 0.1 degree. The display is very easy to read and LCD. It uses LR44 batteries.


  • submerge probe – you will need to submerge the probe into the water for an accurate display of water temperature.
  • suction cups – suction cups are included so that you can easily install the display on the outside or inside of your tank walls.
  • lcd display – easy to read display which can be changed from fahrenheit to celsius on command.
  • large display – very large display making it easier to read even though it’s very compact.
  • lr44 button cell – these are the type of batteries it is powered by.


  • Temperature is off – For the most part, this thermometer has an accurate reading. If anything after a while of use there has been reports of the temperature being off by 1-2 degree Fahrenheit, however, it’s really not that bad if you just need it for general use.

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7. Pet Magasin Digital Thermometer Review

Pet Magasin Digital Thermometer

The Pet Magasin Digital Thermometer is a great pick for anyone who owns fish to reptiles or amphibians. It’s very important to monitor the environment your pet is in, especially if they’re a specific breed of animal. This is a very compact and reasonably priced thermometer. You can read the temperature and humidity on the display, and you can also change between Fahrenheit and Celsius when needed.


  • lcd display – a lcd display which accurately reads the temperature and can be switched from celsius to fahrenheit.
  • lr1120 battery – this is the type of battery that the system uses.
  • monitor humidity – unlike other types of thermometers, this one measures the humidity in the air. this is great for reptiles or incubators.


  • Battery is hard to replace – Some have noted that getting the battery pack open is difficult, this unit is very secure, so it’s hard to get the battery into the socket.

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8. Coralife 00232 Digital Thermometer Review

Coralife 00232 Digital Thermometer

The Coralife 00232 Digital Thermometer is a decent device if you’re looking for a very simple thermometer. It’s a digital thermometer and is only off by a few degrees at a time. It includes a very long probe cord, that way you can set up the actual display somewhere else. The unit is not waterproof so be very careful. It’s ideal for use in either aquariums for terrariums.


  • suction cups – for easy installation, and keeping the unit on the side of the tank.
  • long probe – a 3 foot long probe cord, so that you can easily put the display a ways away from the tank.
  • digital display – an easy and simple display, shows the temperature in either fahrenheit or celsius.


  • Not Blacklight Display – It’s sometimes hard to read in certain lighting. If you want to fix this, put it in an area that isn’t hard to read in. The cord is long enough.

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9. CoZroom LCD Digital Aquarium Thermometer Review

CoZroom LCD Digital Aquarium Thermometer

The CoZroom LCD Digital Aquarium Thermometer is a very basic display. It’s a glass thermometer with a LCD display. It’s very accurate and will help you manage the temperature included in your tank. Installation is super easy, as all you need to do is suction cup it onto the wall of the aquarium. Make sure to submerge the probe into the water or else you won’t get an accurate reading.


  • glass thermometer – unlike other models this one is not made from cheap plastic but instead glass.
  • lcd display – the lcd display is easy to read and displays the temperature in either fahrenheit or celsius.
  • high accuracy – has only .1 inaccuracy, so it’s super effective if you need to keep a consistent temperature.
  • two button batteries – these are the type of batteries this system needs.
  • suction cups – suction cups to help for easy installation and putting on the side of the tank.


  • Suction Wears Out – After a while of use many customers have noticed that the suction cups do not work. Be sure to have a backup way of sticking the display onto the sides of the tank. Many people say that velcro works as a substitute.

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10. Fluval Wireless Digital Thermometer Review

Fluval Wireless Digital Thermometer

The Fluval Wireless is a Digital Thermometer for aquariums and is a very simple device that can be used to measure both water temperature and room temperature. Both of these measurements play a key role in aquatic animal lives. This is ideally used for fish of freshwater or saltwater aquariums. It’s wireless and has a 2-in-1 measurement system. It’s easily mounted on the outside of the tank and does not use any wires or probes. It should be noted that the temperature accuracy is within a 10 celsius or a 20 Fahrenheit degree measurement, give or take. Do not buy this unless you’re okay with a more vague temperature display.


  • measures water & room temp – this thermometer measures both the water temperature inside the tank and the room temperature outside the tank.
  • wireless technology – no need for any messy cords or probes, this works with wireless technology.
  • lcd display – simple display that gives you the temperature readings for both water and room temperatures. it will be displayed in fahrenheit.
  • large display – very large display and easy to see from even across the room.
  • duo display – see both the room temp and water temp at the same time. no need to switch.


  • Inaccurate Temp – Many people are saying that this product works as intended, however, there is one issue. Some people don’t feel like theirs measure correctly, especially with room temperature. The readings are usually around 4 degrees Fahrenheit off. This could be due to the fact that it is a wireless thermometer and that stops it from reading more accurately.

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All in all, best aquarium thermometers have come a long way when it comes to what they do and how they can help you. At least now you know that you are providing your aquatic pets with the correct living environment and that some of these thermometers can even help alert you if there is anything wrong. Older types of thermometers were not as easy to read, would get caked up with bacteria and algae, and they were just overall inaccurate. Now, with these new thermometers, they are easily designed to be read on a digital display which monitors the temperature at all times.

You will need to consider what type of environment and the design of your tank. Some of the best aquarium thermometers measure water temperature, humidity temperatures, and room temperatures. This is great if you’re housing aquatic animals that spend their time both above or below the water surface. If you’re designing a tank you should also consider the size of the display you will buy if you want cords or wireless, and if you should buy one that can be stuck inside or outside of the tank.

So, if we were to select the best aquarium thermometers off the list we would recommend the CNZ Digital LCD Thermometer for Aquariums, as it is the best digital thermometer. The reason for this is because it comes in a variety of different kits, an easy to read LCD display, and you can always use the multiple packs for backups. The lifespan of this thermometer is also good, and many people were satisfied with their purchase of this product. Hopefully, this guide has helped you find the bes aquarium thermometers and we hope you have a great day!

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