7 Best Aquarium Thermometers – (2020 Reviews & Guide)

You may think that the temperature in the aquarium doesn’t need to be monitored carefully…

But when the water in your aquarium is too hot or too cold, this can have negative effects on the plants and fish in the tank.

This is why a very dependable and durable thermometer is important for your aquarium.

The 7 Best Thermometers for Aquarium

This segment will discuss some top-notch thermometers that work great in any fish tank. Any of these would be a great choice to keep the temperature in your fish tank at its ideal level.

Picture	Aquarium Thermometer	Type	Link
	Zacro Digital Aquarium Thermometer	Digital Aquarium Thermometer
	RISEPRO Digital Water Thermometer For Fish Tank	Digital Aquarium Thermometer
	JW Pet Company Smarttemp Thermometer Aquarium Accessory	Non Standing/ Standing Aquarium Thermometer
	American Thermal Instruments Aquarium Thermometer	Stick On Aquarium Thermometer
	General Tools AQ150 In and Out Aquarium Thermometer	Digital Aquarium Thermometer
	SUKRAGRAHA Traditional Stick-on Digital Temperature Thermometer	Stick On Aquarium Thermometer
	Digital Thermometer and Hygrometer for Terrariums and Aquariums	Digital Aquarium Thermometer

Best Aquarium Thermometer Reviews

1. Zacro Digital Aquarium Thermometer

It is important to have an aquarium thermometer if you own a fish tank in order to guarantee that the temperature is maintained at a level that is comfortable for the fish and optimal for their health. An aquarium thermometer should give you the precise temperature readings you need.

This is why you need to invest in one of the best digital aquarium thermometers on the market—like the Zacro Thermometer. This thermometer comes with an LCD display feature that is both precise and easy to read. You can choose to see temperature readings in either Fahrenheit or Celsius, whichever you find easier to use.

You can depend on this gadget to provide exact temperature readings scaled to 0.1 degrees. The range of temperature this aquarium thermometer can register is from -50°C to +70°C. The working temperature is -10°C to +50°C.

To get the best result, the probe should be submerged into the tank to gauge the water temperature. You don’t need to submerge the whole thermometer, only the probe.

The unit isn’t too large, and it has a conservative design that allows for discreet usage. Making use of the suction cup is likewise simple to sustain it.

Pros

• Compact design
• Suction cup is easy to use
• The thermometer is simple to operate
• The LCD display unit is easy to read
• Gives exact temperature readings
• The temperature can be read in Celsius or Fahrenheit

Cons

• Accurate but slow

2. RISEPRO Digital Water Thermometer For Fish Tank

Do you need a thermometer for your fish tank? The digital water thermometer by RISEPRO is a great option for you.

Its ease of use and performance greatly exceed those of other models available. You can easily set it up in just minutes by mounting the display kit in the aquarium and then putting the sensor probe into the water. This thermometer comes with two parts that have suction cups that simplify the mounting process.

This is an adaptable thermometer that functions admirably in various kinds of fish tanks and water. It doesn’t make a difference if you are utilizing freshwater, marine water, tap water or saltwater in your fish tank—the thermometer will function admirably and give you the exact water temperature reading.

This aquarium thermometer is precise and gives a wide range. It gauges from -58°F to +158°F with a precision of +/-1°C. You can decide to make use of either Fahrenheit or Celsius temperature units.

If you have reptiles like lizards and turtles, this thermometer will function admirably to check the temperature of their aquarium living environment.

Pros

• Comes with suction cups for simple installation
• Very affordable – you receive two thermometers
• Additional batteries are provided
• It records a wide range of temperature, which makes it exceptionally useful in that you can use it in any kind of fish tank
• Can show temperature both in Fahrenheit and in Celsius

Cons

• No alarm and alert feature
• While affordable, it is still more expensive than the floating and LCD stick-on types

3. JW Pet Company Smarttemp Thermometer Aquarium Accessory

In case you are searching for something that isn’t high tech or digital, the aquarium thermometer by JW Pet Company is a reliable choice with no fancy bells and whistles. This thermometer has a green “safe” area that shows an ideal range of temperature.

The special design of this aquarium thermometer consolidates a thermometer with a magnetic substance. This device goes into the fish tank and the magnet keeps the Smarttemp thermometer securely in place without the use of suction cups.

Concerning precision, we can say with certainty that the water temperature measurement has a low error margin, if any—presumably + or -.2 °F—and the Smarttemp display has large, easy-to-read numbers.

Also, the Fahrenheit measurement is displayed on a white screen background alongside a “green safe zone” zone in the center. Reading the temperature is quite simple—the visibility on the aquarium thermometer is clear.

The general construction of the aquarium thermometer is excellent; it’s made of high-quality materials, the lodging is built with glass and the fins are plastic. We aren’t sure of what they used to measure the weight of the fins, but the device functions admirably, and it does sink and remains sunken.

Nowadays, it is quite difficult to get good thermometers for the aquarium; most models either break easily or are inaccurate. This brand, however, despite the fact that it is produced in China, appears to be well made and you can expect it to last for a long time.

Pros

• Accurate
• Works fast
• Works well even with intense currents
• It is easy to move when necessary
• Simple to read
• The magnet efficiently keeps it in place

Cons

• Temperature readings may not maintain their accuracy after long periods of use

4. American Thermal Instruments Aquarium Thermometer

When you are purchasing a thermometer for your aquarium, you should be completely focused on getting a device that gives an accurate temperature reading. One great thermometer that will not let you down when it comes to precision is the American Thermal Instruments aquarium thermometer.

This is a very light and compact aquarium thermometer that uses sensitive color-changing fluid crystals. It is very easy to read the temperature because the device is accurately calibrated. This aquarium thermometer functions admirably and reacts promptly to the water temperature when attached to the fish tank.

You can decide to position it beneath the waterline or on the outside of the fish tank. You have to place the thermometer against the side of the fish tank and press it solidly to make it stay in place.

Unlike other LED aquarium thermometers, this device is pretty easy to monitor and read. It displays very large figures that make reading it a breeze. The thermometer is also designed with every temperature pointer in a different formulation carried out under strict laboratory specifications.

Pros

• Gives accurate readings
• It sticks well
• It has sensitive color-changing crystals
• Very easy to read
• Affordable

Cons

• Not precisely accurate because it measures the glass temperature instead of the water

5. General Tools AQ150 In and Out Aquarium Thermometer

This aquarium thermometer is really a great choice, and one of the best thermometers on the market today. It can measure temperatures in the range of -58°F to 158°F or -50°C to 70°C. This device will effectively gauge the temperature in both saltwater and freshwater tanks, and is immune to corrosion and rusting.

To make things simpler for you, this device comes with both a maximum and minimum memory. It likewise features a low- and high-temperature alert which you can adjust to the temperatures you need an alert for. This helps you to maintain a steady temperature in your fish tank in order to keep the inhabitants happy and healthy.

This aquarium thermometer features a modern design that is amazingly sturdy and dependable. It also comes with a smart foldaway stand, which will save you from having to hold it. In addition, it has backdrop illumination for those dark periods.

The jumbo-sized display makes it simple to operate and read, which really enables you to switch back and forth between remote and ambient sensing. In addition, it has a suction cup that enables you to easily attach the sensor inside the fish tank.

Pros

• Ambient and remote sensing
• Comes with a suction cup and stand
• Backlit for easy reading
• Can be switched from F to C
• Min and max memory function
• Works for freshwater and saltwater
• Low and high temp alerts

Cons

• Temperature readings may lose accuracy after a long period of use

6. SUKRAGRAHA Traditional Stick-on Digital Temperature Thermometer

For a simple way to check the water temperature in your aquarium, turn to the SUKRAGRAHA Aquarium Thermometer. It’s a straightforward peel-and-stick configuration that couldn’t be any simpler to install and removes the mystery from whether your fish are in a good environment or not.

These aquarium thermometers are really a lifesaver for ensuring that the water temperature doesn’t get excessively cold or hot. They work beautifully and the temperature display is very clear.

Another great thing about this thermometer is that you don’t need to replace it any time you wash or rinse out your tank. You don’t need to put water specifically on the strips since they will eventually get wet. You can just dry the device off using a towel—they do not become separated or unstuck.

Pros

• Appears accurate
• Easy to read
• No guesswork
• Reliable
• Inexpensive
• The temperature displays clearly

Cons

• Difficult to read without bright light

7. Digital Thermometer and Hygrometer for Terrariums and Aquariums

This is a unique but useful thermometer choice for your aquarium. This device is also a hygrometer, which means that it can read the level of humidity in the air. This is one reason why this model is preferred by so many aquarium owners: since it can be utilized for turtle habitats and terrarium to measure the dampness level in the air.

Obviously, in the meantime, it likewise functions admirably to measure the temperature of the water in the tank. What is really awesome about this device is that you can cling the thermometer on the outside of the aquarium and it will make use of special digital reading methods to gauge the water temperature within.

To connect it, you simply need to remove the protective cover and cling it on to the aquarium anyplace. It utilizes a special kind of gum to cling on, one that doesn’t leave residue or stains and can still be re-stuck in another location. This thermometer is accompanied by a convenient LCD display unit that is large and easy to read.

Also, it can switch between F and C to meet your requirements. It is not submersible inside the tank, but rather, it has a tough external shell and can withstand being sprinkled or misted with water over a long timeframe.

Pros

• Water resistant and durable
• Accurate readings of humidity
• Digital display is easy to read
• Provides readouts in C and F
• Good for both temperature and humidity readings
• Easy to mount and use on the outside of terrariums and aquariums

Cons

• Not completely submersible
• Battery life not very good
• Works great for humidity as well as water temperature

How to Use a Digital Aquarium Thermometer

A thermometer is generally used to measure the temperature of your aquarium water. Some thermometers allow you to constantly monitor the temperature and alert you whenever the temperature rises or drops outside your chosen range or setting.

If you have an exceptionally large tank, you can easily make use of several thermometers to monitor different areas of the aquarium. Simply ensure that the display is easy to view in order for you to be able to know the temperature immediately.

Where to Put a Stick-On Thermometer in an Aquarium

Stick-on thermometers are most widely used in freshwater aquariums. They are often offered as a feature in the latest aquarium package. When making use of LCD thermometers, there are a few tips that should be followed.

1. Do not put them in an area where they will come in contact with direct sunlight, or any area close to a cooling or heating vent. Aquariums shouldn’t be put in areas such as these anyway.
2. Do not put the thermometer below ground level, as this will influence the accuracy of the reading.
3. Finally, the thermometer does provide the best reading when it is viewed straight on, therefore place it properly. If you have any need to twist your body in order to see the thermometer display, it is not in an ideal area.

How to Read an Aquarium Thermometer Sticker/ Strip

Some amphibians and fish are extremely sensitive to changes in temperature and will suffer or even die if the water is excessively hot, excessively cold or fluctuates. An adhesive strip thermometer indicates the temperature of the water by showing three different colors.

Since each color shows different temperature, any individual who hasn’t used a temperature strip before may not be able to get an accurate reading. One-color is the correct temperature, while the others show a temperature that is either cooler or hotter than the correct temperature.

Stage 1

Clean the exterior of the aquarium using aquarium-safe glass cleaner, or simply water. Try not to make use of standard glass cleaners or soaps, as the chemicals used in those products may contaminate your water. Thoroughly dry the aquarium with a towel. Make sure that the glass is totally dry.

Stage 2

Peel the plastic backing off the strip and place the strip on the tank exterior, beneath the uppermost water level. Make sure that the strip is smooth and free of bumps.

Stage 3

Check the strip after 15 to 30 minutes. Three colors will be observed, with each having a number. Green shows a correct temperature, while violet or blue shows a temperature that is beneath the accurate temperature. The tan or red color shows temperature over the accurate temperature.

Types of Aquarium Thermometers

There are different types of aquarium thermometers. It is very essential for you to know the various types that are available in order to be able to pick the right one for your tank temperature modification needs. The most widely recognized kinds of aquarium thermometers are:

1. Digital Aquarium Thermometer

This kind of aquarium thermometer is well known to be the priciest of all, particularly when you buy the best digital thermometer for your aquarium. However, some dependable digital thermometers are really very cheap, despite the fact that they are exceptionally accurate. They aren’t influenced by the ambient temperature of the room.

The setup of the device is normally a probe matched with a digital display that is simple to read. Sometimes, the reading of the temperature is in both °F and °C. Generally, there is a wire that links them to one another, but some always come with a wireless connection. A lot of these devices are powered by batteries, yet some can be connected to an electrical plug.

Sometimes, the probe is placed in the fish tank to constantly monitor the temperature. It might even come with an alarm feature that will notify you when the temperature leaves your chosen range. The thermometer is very robust and is just unbreakable. In case you are searching for the best thermometer for your freshwater aquarium, you will need to check out this category.

2. Floating or Standing Aquarium Thermometer

With this type of aquarium thermometer, you will need to submerge the entire thing. This isn’t digital, so you might experience difficulty reading the little print scale. To tackle this issue, some makers have a wide variety of colors for the protected zone, so you will know immediately when the temperature drops out of your chosen range. However, when you have a huge tank, you might need to consider utilizing a lot of these aquarium thermometers on either side of the tank.

One major concern here is that a large number of these aquarium thermometers are built with glass. That makes the devices to be considerably more fragile compared to the other kinds of thermometers.

However, some models are built with stainless steel while others are built with plastic. Many make use of suction cups to remain set up. Some are highly magnetic, which implies that you can sustain it using a magnet outside. Other models are flowing freely in the water but you can likewise get standing models weighted at the base.

These devices are very cheap. But you may not find some features like LCD readings or even alerts. It is likewise not as accurate as the first type of aquarium.

3. Stick-On Aquarium Thermometer

In some cases, these are known as LCD thermometers since they have a kind of LCD display. Some makers have even attempted calling them digital thermometers, however, they are not similar to the real digital thermometers discussed earlier in this buying guide article. Ensure you aren’t getting an ordinary LCD thermometer when it is a digital one you require.

The stick-on thermometers are positioned on the outside part of the aquarium, and that makes the temperature reading less dependable. Their readings can be influenced by the room’s air temperature. Also, it is really bad if they are positioned in direct sunlight, near vents, heaters and other items or locations that can influence the temperature.

You likewise won’t want to place it underneath the rock level, as it will not be as accurate at that point. The LCD is likewise best displayed straight on, so you need to position it where it can be viewed easily.

Conclusion

One of the essential tools on the mother earth for both tank owners and fish is the Aquarium thermometers since it tells the temperature of the water. This is simply because you generally need to keep the temperature of the water at a reasonable level for the fish. There are three essential kinds to pick stick-on, floating/standing, and digital.

However, the most preferred kinds are the digital aquarium thermometers. The digital thermometers reviewed in this are almost the same, and they are quite a great choice. But if we should pick one, it would be the Zacro Digital Aquarium Thermometer. The LCD display is somewhat better compared to the other options reviewed here. In addition to the fact that it’s the number top-rated seller makes it a great choice.