Best Aquarium Thermometers In 2021
We use thermometers every day. From checking your body temperature to adjusting the ambient air with the help of a home thermostat, thermometers are undoubtedly an everyday item. An aquarium thermometer simply takes it a step further in the sense that it accurately reads water temperature in your fish tank.
Anyone who knows anything about fish knows that they can only survive in water that’s set at a certain temperature, as such, owning an aquarium thermometer is very important. Typically, most fish need the water to stay at a temperature between 76° to 80°F (25° to 27°C), and this will be incredibly difficult to achieve without a thermometer. With that said, let’s take a look at some of the best aquarium thermometers on the market.
The Best Aquarium Thermometer
First on the list is the Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature, a truly amazing product that gives accurate readings to within one degree. Furthermore, it features a handy LCD screen with a large display, which makes it a lot easier to see the readings. On top of that, it gives readings in both Fahrenheit and Celsius, as such, you get to choose which is more convenient.
Speaking of convenience, the device itself is very easy to use, you only need to place the probe in the water and you’re well on your way to getting accurate results. Also, the Zacro thermometer features a compact design that makes it easy to carry around and use with ease. It is even powered by one LR44 button cell, which is included in the package and lasts for a decent amount of time. You’ll definitely like the fact that the device is backed by a 24-month warranty and a 45-day money-back guarantee, so your mind will be at ease. Make sure to check out our list of the best aquarium air pumps as well.
Accurate reading to within one degree
Large LCD that’s easy to see
Powered by reliable LR44 button cell
Works well with fresh or salty water
- Weight0.32 ounces
The Zoo Med Digital Thermometer is yet another great device that provides you with accurate readings from your aquarium or goldfish tank. You need to make sure you’re armed with one of these babies, especially as weather conditions change. For instance, it is advised that you check your fish tank’s temperature in the winter to ensure that it isn’t too cold. There is no way you’ll be able to get a handle on the situation without getting an accurate reading. This is one thing that the Zoo Med thermometer can offer excellently.
Also, if you’re interested in aesthetics, you’ll really like this piece. It is equipped with an attractive design featuring colors that pop and is equally portable enough to fit into your pocket. What’s more, using it is effortless, you just need to discreetly place the probe in the fish enclosure and push the power button to turn on the device. In addition to all this, you can get your readings in either Fahrenheit or Celsius and the large display makes it incredibly easy to read. Even more, the thermometer can sense and read temperatures ranging from -10° to 140℉, which creates a more convenient experience.
Can read temperatures between -10° to 140℉
Displays readings in either Fahrenheit or Celsius
Very easy to use
Compact design that fits into your pocket
- BrandZoo Med
- Weight1.12 ounces
JW Pet has been producing excellent pet accessories since 1998 and has proven its quality time and again. Since its inception, the company has followed their passion to ease the lives of pets and their parents. Taking it up a notch, all their products are made using the highest quality materials, backed with sound research and data. So, it’s no surprise that their JW Pet Company Smarttemp Thermometer also displays these values which come together to make up a truly exciting fish tool.
This device features a unique design that happens to be very user-friendly and straightforward to use. Thanks to its unique construction, this thermometer doesn’t need any suction cups and can easily be placed in the aquarium with the aid of a simple magnet located outside the tank. A handy addition here is the green zone embedded in the device, which lets you know the optimum temperature. With this at your disposal, you can easily check if the water temperature is within the safe zone, and thanks to the large display numbers, reading is not a challenge at all. Don’t forget to check out our list of the top aquarium filters, too.
Innovative design makes it easy to use
Doesn’t need any suction cups
Easily identifiable green zone
Large display numbers that are easy to read
- BrandJW Pet
- Weight0.96 ounces
What is better than one aquarium thermometer? You guessed right if you said four aquarium thermometers! With VIVOSUN 4-Pack LCD Digital Aquarium Thermometer, you get incredible value for money, which is so great because not many products can boast of this. Even more, the thermometer is packed with a range of incredible features that make it the ideal fit for your aquarium.
Firstly, the thermometer reads temperature accurately to within one degree, so you’re sure of its accuracy. Also, you can easily switch between Fahrenheit and Celsius, that’s some major versatility is in the bag. Further, with a large display panel, seeing the relevant numbers is increasingly easy and convenient.
Another standout feature here is the length of the cable; at 39.37 inches, it is way longer than standard cables. Therefore, it is suitable for even the largest tanks and aquariums. Moreover, the package comes with suction cups that make the probe easier to attach to the aquarium. With all of this, it is clear that this is an incredible product that will undoubtedly last for a long time while serving you adequately.
For more must-have products for fish tank owners, check out our guide to the best aquarium heaters.
Comes with four aquarium thermometers
Super long cable for even the largest aquariums
Easy to read display
Accurate readings to within one degree
- Weight4.9 ounces
is obviously easy to read. What good is a thermometer if you can’t actually see any readings? All in all, this feature makes it a lot easier for people with less than 20/20 vision, further making the thermometer an accessible device. Based on this, the Windbells Aquarium Thermometer is an ideal product, and all this pivots on its fantastic display, which can be viewed from a mile away.
On top of this, the results can be read in both celsius and Fahrenheit, so, you don’t need to bother google for any conversions. Versatility is not only a strong suit here, but accuracy is also guaranteed and the readings cover a wide range falling between -50 to +70℃. That’s not all, the fact that this thermometer is really easy to use is great, but it is equally easy to set up and install. That alone takes it all the way up to rock star status. And, of course, it has a durable battery, so you can bank on the fact that you have a reliable machine that won’t fail you when you need it most. If you are going out often, make sure to have a reliable automatic fish feeder, too.
Large display that’s easy to read
The durable battery that lasts long
Able to display temperatures in both Celsius and Fahrenheit
Easy to set up and maintain
- Weight0.8 ounces
A lot of the thermometers on this list come in a compact design, which is great if that’s what you’re looking for. But, if you are in the mood for a thermometer with a fresh and innovative design, then the SUKRAGRAHA Traditional Stick-on Aquarium Thermometers are just the set for you. These stick-on thermometers feature 10 highly functional strips.
Furthermore, its traditional design means that you don’t have to worry about batteries running out. Also, with its easy application, using this baby will be nothing less than a walk in the park. You’ll like the fact that the strips can provide readings in both Celsius and Fahrenheit. To crown it all up, this particular option won’t leave a dent in your wallet. All in all, if you want a little variety in your aquarium thermometers, then this is a perfect product to purchase.
Incredibly easy to use
Reads in both Celsius and Fahrenheit
Doesn’t need any batteries
10 pieces in every pack
- Weight0.6 ounces
Though we have already looked at thermometers sporting interesting designs, the Capetsma Aquarium Thermometer really takes the crown there. First, it comes in a trendy, compact design that happens to be quite attractive and ergonomic. Also, this thermometer doesn’t use probes, but rather employs the use of a backside temperature sensor.
To use it, you simply need to stick the thermometer to the side of the aquarium, and the device does the rest. When it comes to the actual readings, there’s a couple of things that will interest you. You’ll definitely like that the display is large and very easy to read, and with its touch-screen operation, it suits tech-savvy fish owners. Additionally, the readings are accurate within a degree, and it has a range from between 0°C to 70°C / 32°F – 158°F.
Sure, the tech-heavy features of this device may worry some less savvy users, but it shouldn’t as it is pretty straightforward and can be operated by just about anyone. You’ll like the fact that it comes with an extra battery, so you can bank on the fact that you have a reliable device. That’s not all, this thermometer can equally work in freshwater, saltwater, tap water, and so on.
Innovative design that is both compact and portable
Doesn’t need any probe and instead uses backside sensor
Accurate reading to within one degree
Accompanied by an extra battery for greater longevity
- Weight2.08 ounces
The AikTryee Aquarium Thermometer is an excellent product for anyone serious about having pet fish. These square-shaped thermometers are constructed using high-quality stainless steel material for the probe. Meanwhile, it also reads temperature accurately and alerts you of the condition of the water. Also, its 1.6-inch LCD screen is impressive and easy to read thanks to the large display numbers.
Then, there is its user-friendly design and display, which can easily be used by both children and the elderly. Additionally, with a range of -58 ℉ -+230℉, you don’t have to worry about unreadable temperatures. On top of that, the battery is also of the highest quality and can last as long as eight months. Most importantly, this package comes with an extra aquarium thermometer, which offers you incredible value for money and an extra battery for each device.
That’s not all, also included in the package is a double-sided tape, batteries, suction cups, and so much more. And, with 20+ years of experience creating great pet accessories, AikTryee has developed a brand that is both trustworthy and reliable. So, what’s stopping you from checking this incredible product out?
Useful for fishes, turtles, lizards, and so on
The 1.6-inch display screen that’s easy to read
Can be used by both kids and the elderly
Powerful probes made with high-quality stainless steel
- Weight2.4 ounces
Marina Floating Thermometer is a different type of product that basically floats in water and gives accurate readings. Sure it sports a simplistic design, but with thermometers, less is more. Then, there’s its durable construction which is ample proof that it will last for a decent amount of time. Furthermore, this thermometer can be placed directly into water without damaging any of its handy parts. Best believe that this feature makes it incredibly convenient to use, even in smaller fish bowls.
On top of that, the thermometer features a green zone that helps you determine whether the water is safe for your pet fish. Even more impressive is the fact that it can easily measure temperature in Celsius and Fahrenheit. So you don’t have to stress out about reading it. As mentioned earlier, this device is so easy to use, but even better is the fact that it doesn’t require any batteries. All in all, that points to the fact that it is made to last longer than most thermometers on the market. Additionally, the device is very versatile and can be used even in saltwater, which makes it a lot more than a one-trick pony. So, with stellar reviews and customer satisfaction guaranteed, you can safely buy this product with no worries.
Easy to use and maintain
Doesn’t need any batteries
Made with quality materials
Features a green zone for easier measurement
- Weight0.352 ounces
LCR Hallcrest is a family-owned business that has made a name in the area of thermographic. Furthermore, they have consistently created amazing, cutting edge products that consumers can’t help but fall in love with. So, it’s easy to see why a product like the LCR Hallcrest A-1005 Liquid Crystal Vertical Aquarium Thermometer is such a great hit with pet owners everywhere.
Jumping into the specifics, the first thing you notice is its unique design that incorporates liquid crystal. Also excellent is how easy it is to use; it only needs to be placed vertically on the outside of an aquarium to display an accurate reading. Furthermore, it reads accurately and has a temperature range of -30 to 90°C. There’s also the fact that you don’t need batteries which ensures that the device lasts even longer. Finally, its compact design means it can be conveniently stored and doesn’t take up too much space.
Makes use of liquid crystal
Temperature range of -30 to 90°C
Doesn’t need any batteries to work
Easy to read and mount
- BrandLCR Hallcrest
- Weight0.32 ounces
Aquarium Thermometer Buying Guide & FAQ
Before you pop out to the store or an online shop to purchase a new aquarium thermometer, there are a few things you need to consider. Luckily, we will be examining them below.
Features To Look For In Aquarium Thermometers
Accuracy - This is incredibly important because, without an accurate reading, you won't know how comfortable your fish is. You see, if you get a faulty reading, you are more likely to do something harmful to your fish.
Let's say you make the water hotter, you'll probably boil your fish to death, and that's not a good way to go. So, before buying a thermometer, ensure that it comes from a brand that is trusted for its accuracy. Also, you can read reviews and ratings to see if other consumers were pleased with its level of accuracy.
Durability - Generally speaking, aquarium thermometers are inexpensive tools, but if you have to buy a new one every two weeks, the expenses begin to pile up. To prevent this, make sure you buy a thermometer that is strong and capable of lasting for a while. Even better, you could go for products that have more than one thermometer packaged with them, as this simply means it will last for longer.
Ease of Reading - Not everyone has a perfect vision so, if you get a hard-to-read thermometer, it could lead to mistakes that could harm your pet. This is why devices with large display screens and numbers are so popular nowadays. If you don’t want a digital thermometer with a large display, then you can get a floating or standing thermometer with large numbers.
Power Options - All digital thermometers run on some sort of battery, and this is fine, but ultimately, batteries die or fail. So, if you would rather not deal with them, you can get stick-on or floating thermometers which don’t use batteries but still display accurate readings.
Types Of Aquarium Thermometers
Digital - These are the most common types of thermometers; they are characterized by their slim designs and their use of suction cups and probes. Consequently, using them is easy, and you simply need to place the probe in the water (not the thermometer itself), then turn on the device, and it gives an accurate reading. Additionally, they use batteries and can often give measurements in both celsius and Fahrenheit.
Floating or Standing - This type of thermometer is slightly different because they don’t use batteries and come as one whole package. On top of that, they can all be placed in the water because they aren't susceptible to water damage. Also, most of these thermometers are equipped with something called a ‘green zone’ which is the optimal temperature for the water. This feature makes it much easier to determine if the water is the right temperature for your fish.
Stick-on - These are a lot different from the other two as they don't feature any advanced technology. It is also typified by how easy it is to use as you only need to remove the tape and place it on the side of the fish tank. Just like the floating thermometer, it doesn’t need any batteries and is usually cheaper than other types of thermometer.
Aquarium Thermometer FAQ
Q: What is an aquarium thermometer?
A: An aquarium thermometer, as the name implies, is a device used to check the temperature of the water in a fish tank or aquarium. This is important because fishes thrive in a certain environment, and this is easier to achieve with the help of a thermometer.
Q: How to use a digital aquarium thermometer?
A: Using a digital thermometer is easy and doesn’t require many steps. Start by placing the probe that comes with the thermometer in the water and secure it with the suction cup. It is important to note that you shouldn’t put the monitor in the water, too, as this could damage it. Proceed to turn on the digital thermometer and apply it with the help of a suction cup
Q: Where to put a stick-on thermometer in an aquarium?
A: Stick-on thermometers are easy to use and can be placed on the side of the aquarium. That said, it should be noted that they are to be kept away from direct sunlight or cooling/heating units, as this affects the reading and accuracy.
Q: How to read an aquarium thermometer sticker/ strip?
A: While installing the sticker thermometer poses no challenge at all, some users might find it difficult to read. However, once you get the hang of it, it’s quite easy. First off, check the rainbow display. While the blue/violet and the red/orange parts give readings, they aren’t the accurate reading. You should be looking out for the reading located around the green area, which is situated in the middle of the rainbow.
Q: Where is the best place to put a thermometer in a fish tank?
A: When it comes to a stick-on thermometer, it is best to place it on the side of the tank. Meanwhile, a floating thermometer goes on the surface of the water, while digital probes are best attached to the inner side of the tank.
Q: Are sticker thermometers accurate?
A: Most thermometers are accurate, but the digital ones are by far the most accurate of all. Even with that, there is still a margin for error, so always be careful.