7 of the Best Aquarium Thermometers Reviewed and Compared

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Although the ‘Keynice Digital’ isn’t designed exclusively for aquarium use its good degree of accuracy, as well as the rustproof stainless steel probe makes it suitable for this purpose.

This is an affordable digital thermometer, that’s reliable and durable enough to trust with the wellbeing of your fish.

The Keynice is a digital model that comes with a probe, which must be submerged in your fish tanks water. Since it’s not explicitly designed for aquarium use, it doesn’t come with a suction cup or similar to mount it to the outside of the tank, which can be inconvenient.

It is powered by USB. Since it will be in constant use, it’s not practical to power it using the USB port on your computer. Instead, you’ll need a USB adaptor for your power outlet, or a modern power outlet that features an integrated USB port.

The Keynice is comprised of the main body, on which there’s a screen that shows the temperate, and the probe, which takes the temperature and is attached by a wire to the main body. The probe goes in your aquarium, and the main body stays outside the tank so that you can read the results.

It can measure a range from -58 to +230 degrees Fahrenheit (that’s -50 to +110 degrees Celsius). The accuracy is +/-1 degrees Fahrenheit. The large digital display is extremely easy to read.

The probe sits inside the tank, under the water, whereas the main body remains external to the tank.

This is an extremely well-made thermometer, which appears to be both accurate and reliable.

It’s not the easiest to install, however, as it doesn’t have any means to mount it to your aquarium included, so you’ll need to figure out how to mount it yourself.

You can change between Celsius and Fahrenheit, although the switch that changes the display between the two is on the back of the unit, so it’s tricky to access once the unit is mounted.

Overall, this is an excellent digital thermometer that’s a steal for the quality. It might not feature many extra features, but it’s durable and reliable, and takes top spot as our pick for best aquarium thermometer.

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We’re not 100% sure, but it seems to be that all three of these brands of digital thermometer are made by the same manufacturer, and then sold by different companies under their own branding.

Apart from the branding, the Zacro, RISEPRO, and HDE are all exactly the same, in looks and functionality, so buy whichever one has the best deal on at the time of buying.

Although basic, these aquarium thermometers offer decent value for money for fish keepers on a budget.

These are digital thermometers with probes. Each comes with a suction cup to attach to the outside of the tank.

All three models, The Zacro, RISEPRO, and HDE all run on a single button cell battery. You’ll get one included in the pack, and you may get a spare, depending on which option you choose.

They feature a probe that you submerge in your tank, which is attached to the main body of the unit with a wire.

You can stick the main body of the machine to the outside of the tank, using the suction cup.

The probe monitors the temperature, them feeds the results back to the body of the thermometer, where the results are displayed on the LCD screen.

Not only do these thermometers have a wide range of between -58 and 158 degrees Fahrenheit (-50.0 to 70.0 degrees Centigrade), they’re also accurate to +/- 1-degree Fahrenheit.

Thanks to the large LCD screen, it’s effortless to read the temperature.

While you place the main body on the outside of the fish tank, the probe goes under the water, giving an accurate reading.

These thermometers are decent enough, considering how inexpensive they are, but don’t expect them to be quite as durable or reliable as some other models.

Installation is straightforward: Stick it on the outside of the tank, the probe in the water, turn it on, and you’re ready to go.

If you’re looking for a cheap and cheerful digital aquarium thermometer, look no further. All three models are available on Amazon.

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Simple and affordable, yet effective, it’s hard to go wrong with the Marina Floating Thermometer.

Since it’s made of glass, it is technically breakable, but it’s very unlikely to shatter in the tank, even if you have fish that like to get into everything.

This is a floating thermometer with suction cup to stick it to the aquarium wall, and it doesn’t require a power source.

If you’re looking for a simple thermometer, this floating model fits the bill.

Simply put it in your tank, stuck to the inside of the glass using the enclosed suction cup, and it’s ready to use.

It works like a traditional mercury thermometer (though the liquid inside isn’t mercury)—as the temperature rises or falls, so does the liquid inside, allowing you to take temperature readings.

The Marina Deluxe has a temperature range of between 30 and 120 degrees Fahrenheit, which is more than adequate.

While it’s fairly easy to read, those with poor eyesight might struggle to read the markings. It does, however, feature a safety zone indicator, which makes it easier to tell if the temperature is in the correct range.

You must place the Marina floating thermometer inside the tank, held in place by the suction cup. Since it remains fully submerged, it tends to get very accurate readings.

It could hardly be easier to install this thermometer; Stick it on the inside of your aquarium, and it’s ready to go.

Since it’s made from glass, it’s not the most durable option available, but the fact it floats means it won’t drop to the bottom of the tank where it could smash, even if the suction cup comes unstuck.

If you’re in the market for a floating thermometer, this one comes highly recommended.

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The ‘American Thermal’ is a basic, inexpensive LCD model. It isn’t the most high-tech or accurate option out there but will suffice for hardy fish who can deal with some temperature fluctuations, or as a backup to give you a rough idea of the water temp.

This is a stick on variety, which means it has an adhesive back, which adheres directly to the outside of the tank. This particular stick on model is designed to be movable, so you can peel it off your tank and stick it back down.

As a stick on type, the ‘American Thermal’ doesn’t require a power source.

All you need to do is stick it on the outside of your aquarium, and it will give you a temperature reading. It is sensitive to changes in temperature, and the thin LCD display lights up the appropriate reading on the strip.

It has a temperature range of 64 to 84 degrees Fahrenheit.

The manufacturer doesn’t list the degrees of accuracy, but regular users have had mixed results.

Some say it’s accurate within 2 degrees Fahrenheit either way, whereas others have found it displaying temperature readings up to 5 degrees higher or lower than true, which could be an issue.

It’s not the easiest thermometer to read in bright light or from an awkward angle, rather than head-on.

This thermometer remains completely external to the tank, meaning it’s influenced by the ambient room temperature and doesn’t get 100 percent accurate readings of the water temperature inside the tank.

The ‘American Thermal’ is extremely easy to use and install—just stick it on and go. Plus, the design makes it extremely difficult to break.

However, this (and other stick-on types) wouldn’t be our first choice, as it lacks the accuracy of other options.

As far as stick on thermometers go, the American Thermal is an excellent choice. We like that it’s movable, so you can switch it between tanks or change the positioning, if necessary.

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The Fluval EDGE Digital Aquarium Thermometer is a simple stick on model that comes from a trusted brand in the world of fish keeping.

It might not be as flashy or accurate as some other options, but it’s straightforward to use and is excellent for tanks where being a degree or two out won’t make a difference to the wellbeing of its residents.

Though it’s described as a digital thermometer, this is, in fact, a stick on model. It sticks to the outside of the tank, so you can easily position it somewhere that’s easy to see, but won’t obscure the view into your aquarium.

As a stick on model, the Fluval EDGE doesn’t require any sort of power source.

The Fluval EDGE sticks to the outside of the aquarium. The gel material of the adhesive reacts to changes in temperature and lights up the relevant temperature markers.

The Fluval EDGE can read temps between 64 and 86 degrees Fahrenheit, which is significantly less than many other models. The accuracy is only around +/- 2 degrees Fahrenheit, which also isn’t ideal.

Furthermore, it’s not always easy to read the temperature from this thermometer, particularly in bright light. Plus, temperatures are listed in increments of 4 degrees Fahrenheit, so the reading scale could have been better designed (though it’s not hard to gauge mid points, quarter points etc., so cannot be described as ‘hard to read.’)

Since the Fluval EDGE is installed on the outside of the tank, it’s not the most accurate, as it’s trying to measure from the outside of the fish tank glass, and hence can be affected by the ambient room temperature.

While very easy to install, the Fluval Edge wouldn’t be our first choice.

It’s great for getting a rough idea of the temperature, but you should have a backup thermometer for taking a more precise reading if it’s on the high or low end of the acceptable range.

Because it’s essentially just a sticker strip, it’s highly durable and won’t crack or shatter.

But anyone looking for a quality stick-on aquarium thermometer would be remiss if they didn’t consider the Fluval EDGE.

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The TAAM Rio Aquarium and Pond Floating Thermometer is a simple floating type that’s accurate, reliable, and durable. It costs a little more than some similar models, but it’s hardly going to break the bank.

As a floating type, it goes inside the tank where it floats near the surface. It comes with a rope you can use to tether it if you wish, but it won’t do any harm if you do leave it free-floating.

The TAAM Rio is entirely analog—it doesn’t require batteries or mains power.

Simply plop the TAAM Rio into your aquarium, and it will start working right away. It floats vertically, so it remains the right way up for easy reading.

While it does come with a tether, this is really for use in ponds—most fish keepers leave it free-floating in an average aquarium.

The TAAM Rio has a temperature range from 20 to 120 degrees Fahrenheit and is accurate to within -/+ 1 degree Fahrenheit and features very easy-to-read markings.

This thermometer goes inside the tank, submerged underwater, which gives it more accurate readings than those located outside.

We love how easy the TAAM Rio Aquarium and Pond Floating Thermometer is to install—you just have to place it in the water.

It’s also very durable, as it’s made from made from high-impact plastic, rather than glass.

This durable thermometer is extremely easy to use and won’t let you down.

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The LCR Hallcrest A-1005 Liquid Crystal Vertical Aquarium Thermometer is one of our favorite stick on types available.

It’s easier to read than other models and seems to be reliable and reasonably accurate, although it won’t stand up to digital models.

This is a stick on type, which means it simply sticks to the outside of the tank, and it doesn’t require any source of power.

One of the simplest types of thermometer, this model sticks to the outside of the glass, where it takes the temperature of the water from the other side of the glass.

The temperature range is from 65 to 85 degrees Fahrenheit. While it only features a scale to be read in two-degree increments, it offers a color-based system for working out the precise temperature.

Whatever’s lit up in the green box is the current temperature range. If the brown box above is lit, the water is 1 degree higher than the number in the green box. If the blue box below is lit, the water is 1 degree lower than the number in the green box.

The LCR Hallcrest A-1005 is installed external to the aquarium, on the outside of the glass.

Not only is it extremely easy to install—just stick it on the outside of the tank—it’s super durable, too.

While it’s fairly easy to read, once you get the hang of it, the system of displaying temperatures isn’t as intuitive as with digital or floating/standing models.

It might not have all the bells and whistles, but this thermometer is easy to use and serves its purpose well.

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