We are here today to talk about everything to do with aquarium thermometers and which ones are the best possible options for you to go with for your fish tank.
The water temperature in your aquarium is an extremely important thing to monitor in order to keep your fish alive and healthy. Some fish need warmer water and some need colder water, with the best way to keeping track of it being an aquarium thermometer. so it's important to get your hands on the best aquarium thermometer you can. This our top pick and what we recommend.
What Is A Aquarium Thermometer & What Does It Do?
We assume that everyone knows what a thermometer is. Well, an aquarium thermometer is one which measures the temperature of the water in your aquarium. Some may also come with a feature that alerts you when the temperature falls below or rises above a certain point.
Fish need water that is of a specific temperature, and these are tools which allow you to keep your fish happy and healthy by keeping track of water temperature.
A protein skimmer is also a good piece of kit to consider for keeping your aquarium nice and clean.
What Makes A Good Aquarium Thermometer?
These things are pretty basic so there are just a few things that you need to look out for before you make your purchase. One of the most important things to consider is what the temperature range of the thermometer in question is. It should be able to go at least as low as 10 degrees Celsius and up to 40 degrees Celsius. If you are looking for a heater then check out our aquarium heater buying guide here, we reviewed 9 of the best options.
Another thing that you definitely need to pay attention to with any aquarium thermometer is the accuracy level which it has. The thermometer you get should always be accurate to within at least +/- 1 degree Celsius, and the more accurate it is, the better. On that same note, ideally an aquarium thermometer should display the temperature in both Celsius and Fahrenheit.
A good aquarium thermometer should either be able to be fully submerged in the water, or should have a probe attached to a cable and an LCD display for easy reading. Moreover, a good aquarium thermometer does not have to be digital or electronic because mercury thermometers or color changing crystal thermometers work fine too.
Benefits Of Using A Thermometer
Like we mentioned before, most fish need a very specific water temperature to stay alive, therefore being able to monitor the water temperature is crucial to the health and happiness of your fish.
Having a thermometer to measure the water temperature in your aquarium will let you heat or cool down the water in your fish tank as your fish need. These things remove the need to guess at the water temperature in your fish tank.
Our Top Pick And What We Think Is The Best Aquarium Thermometer
If you need a great aquarium thermometer that is very durable and even more reliable, we definitely have a great choice for you. The following aquarium thermometer is in our opinion one of the best options.
Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature
The Zacro LCD is definitely one of the better options out there to go with, and it’s thanks to the convenient nature of it, its durability, and its ease of use. You can check the current price here.
One of the things that we really like about this particular aquarium thermometer is that it is powered by one single LR44 button cell battery which lasts a very long time, plus it can be easily replaced as well for continued use.
Another thing that is very beneficial about the Zacro Aquarium Thermometer is that it has a massive temperature range. This thing can measure temperatures anywhere between -50 degrees Celsius and +70 degrees Celsius, making it one of the most versatile thermometers out there.
There is also the fact that this model of aquarium thermometer is extremely accurate and it can measure temperature to within +/- 0.1 degrees, this being very accurate.
Moreover this thermometer has a large easy to read LCD display so you don’t need a magnifying glass when trying to read the temperature. Even though the screen is fairly large, the whole thermometer is actually pretty small, making it very portable and easy to store in small spaces.
This thing is also convenient because it comes with a suction cup so you can stick the thermometer on the outside of your fish tank, while keeping the temperature probe submerged on the inside of the tank for continuous temperature readings. If you want a durable and accurate aquarium thermometer, this thing definitely makes for a prime choice.
- Suction cup to hang it on the side.
- Probe can be submerged for easy use.
- Small and compact nature.
- Large easy to read LCD display.
- Powered by a simple to replace button cell battery.
- Wide temperature range with accurate readings.
- Battery connection may be a little loose.
6 Other Great Options To Consider
When it comes to great aquarium thermometers we would of course recommend the above option, but if you don’t see it the same way we always have 6 other options which might suit your needs and likes a little more, so here they are.
1. CNZ Digital LCD Thermometer for Aquarium Fish Tank
This is a great option to go with in terms of aquarium thermometers and it comes in at a close second to our number one option. You can check the current price here.
Something that you will definitely like about this particular aquarium thermometer is that it is an extremely accurate device that can measure temperatures to within +/- 1.5 F of the actual temperature, making it one of the more precise options out there. There is also the fact that this thing has a very wide range which it can measure.
The CNZ Thermometer For Fish Tanks can measure temperatures anywhere from -10 degrees Fahrenheit to 140 degrees Fahrenheit. Just in case you don’t like reading temperature in empirical measurements you can always set this aquarium thermometer to display the temperature in Celsius. Another convenient factor is that this thing runs on replaceable batteries that can be found in virtually any store.
We like the fact that this thing can be used for both aquariums and terrariums with ease. Even better is the easy to read LCD display that is fitted on this on this compact temperature reading device.
The CNZ is also very convenient because it comes with ready to mount suction cups for easy installation, plus a 39 inch long cable with the temperature reading probe at the head, making it great for larger aquariums.
- Easy to read LCD display.
- Measures in both Fahrenheit and Celsius.
- Extremely accurate with a wide temperature range.
- Long cable with the probe.
- Comes with ready to mount suction cups.
- Ideal for aquariums and terrariums.
- Screen could be a little more durable.
2. KollerCraft TOM Temp Alert Digital Thermometer
This is a fairly advanced aquarium temperature reading device that is fairly durable, very accurate, and will definitely help you keep the temperature in your aquarium at the level which you want it at. It is a special thermometer meant to alert you of changing water temperatures so you can keep your fish alive.
One of the coolest features of the KollerCraft Digital Thermometer is that it features audible and LED notifications which can alert you of the water temperature. You can set a minimum and maximum temperature at which the water should be at, and when the water temperature falls below or rises above that preset level it will alert you so you can make changes accordingly.
Another thing that is pretty neat about this this is that it is corrosion proof, making it ideal for both fresh water and salt water aquariums. It is also a really good option because it comes with suction cups so you can stick the thermometer on the outside of the fish tank or even on a wall beside the aquarium.
The KollerCraft also has a 3 foot long cord which makes it more than convenient to place in any way which you see fit. This is a very accurate thermometer that can read temperature very well without question. Overall this is a good thermometer with alert features for fish safety, plus it is convenient and easy to use as well.
- 3 foot long cord with temperature probe.
- Preset alerts to tell you of rising or falling temperatures.
- Ideal for salt water and fresh water aquariums.
- Audible and LED notifications.
- Suction cups for easy mounting.
- Temperature may be off by as much as 2 – 3 degrees Fahrenheit.
3. TOOGOO Digital LCD Fish Aquarium Marine Vivarium Thermometer
Yet another great option to go with in terms of aquarium thermometers is the TOOGOO Aquarium Thermometer. It has a wide temperature range, is fairly rugged, and very convenient to use as well.
One of our favorite features when it comes to this particular model of aquarium thermometer is that it is fairly compact so it doesn’t take up too much space. However even though it is fairly small, it does still have a large and easy to read LCD display for your convenience. Also quite convenient is that it runs on simple to replace batteries that can be found in most stores.
Another thing that greatly adds to the convenience of this device is that it has a very high quality suction base that is sure not to fall off of the wall or the side of your fish tank, not to mention that it is very easy to install. Even better is that it has a very long sensor cable which means that you don’t have to have this thermometer directly beside the fish tank.
Something else that you can definitely appreciate about the TOOGOO Aquarium Thermometer is that it has a working range of between -50 and +70 degrees Celsius, making it one of the thermometers with the widest temperature ranges out there. There is also the fact that it is very accurate, not to mention that it is pretty rugged as well.
- Runs on replaceable batteries.
- Easy to mount suction cups.
- Long sensor cord.
- Very wide temperature reading range.
- Easy to read LCD display.
- Small and compact.
- May be off by as much as 3 degrees.
4. Marina Floating Thermometer with Suction Cup
If you need a simple to use thermometer that can simply float in the water and has accurate readings, the Marina Floating Thermometer is definitely a good choice to go with.
This is perhaps one of the easiest and simplest to use aquarium thermometers that you could go with. While it does not use a probe and does not have an LCD display, it does use the time tested method of using mercury to measure temperature. This fact alone makes it an extremely accurate thermometer that will never be off point in terms of the reading it gives you.
This thing is very simple to use in the sense that all you have to do is place it in the water. It is a floating thermometer that you simply place in your aquarium to get accurate temperature readings. Even better is that it comes with a suction cup so you can stick it onto the inside of your aquarium wall so it will stay in place.
For your convenience the Marina Floating Thermometer displays the temperature in both Celsius and Fahrenheit, plus it even has safety zone indicators so you can tell when the water is too cold or far too hot for your fish. This is a very simple to use basic thermometer that does not require any batteries and gives you an accurate reading 100 percent of the time.
- Does not need batteries.
- Simply let it float in your aquarium.
- Suction cups to attach it to the side of your fish tank.
- Gives you accurate readings 100 percent of the time.
- Easy to mount and easy to read.
- Displays temperature in both Celsius and Fahrenheit.
- Temperature reading is somewhat small.
- Suction cups may leave marks on the inside of your fish tank.
5. HDE LCD Digital Fish Tank Aquarium Thermometer
The next best aquarium thermometer to go with is the HDE Digital Fish Tank thermometer. It is a great piece of fish keeping equipment that will definitely let you know what the water temperature is like without a doubt.
We really like the fact that this model of aquarium thermometer is extremely accurate. This thing can give you readings that are accurate to within +/- 0.1 degree Celsius for maximum precision. Even better is how the HDE Fish Tank Thermometer has a working range between -50 degrees Celsius and +70 degrees Celsius, definitely making it one of the more versatile options that you could go with.
Another feature that we really like when it comes to this aquarium thermometer is that the probe is attached to a fairly long cable for your convenience. All you need to do is to submerge the temperature reading probe in the water in order to get an accurate reading. Plus you can simply attach the display to the side of your aquarium with the included suction cups.
The LCD display is large and very easy to read, not to mention that it gives you the choice of displaying the temperature in either Celsius or Fahrenheit. This thing runs on simple to replace batteries that can be found in most stores, something that is definitely very convenient.
Overall this is a compact aquarium thermometer that is easy to mount and gives you consistent temperature readings, all in order to keep your fish as healthy as can be.
- Reads in both Celsius and Fahrenheit.
- Easy to mount with suction cups.
- Long cable attached to the probe.
- Runs on easily replaceable batteries.
- Easy to read LCD display.
- Compact design.
- Not the most durable design.
6. American Thermal Horizontal Aquarium Thermometer
If you want a basic and simple to read thermometer then you should definitely consider the American Thermal Horizontal Aquarium Thermometer.
This is very simple to use thermometer. All you need to do is to peel away the film on the back side of it and stick it to the inside of your aquarium and make sure that it is fully submerged. Instead of using an electronic probe with an LCD display, it uses simple color changing crystals which indicate a narrow temperature range.
The colors of the crystals in the thermometer change depending on the temperature in the tank. The color can then be compared to the color chart to get a very accurate reading. There is nothing difficult about this thing. Simply place it in the water and let the crystals go to work.
- Fairly accurate.
- Color changing crystals.
- No batteries needed.
- Just stick it to the inside of your aquarium.
- May be 1 or 2 degrees off.
- Adhesive could be a little stronger.
An aquarium thermometer is a really useful tool to have if you are an aquarium owner. We would obviously recommend one of the above options, all of which are fairly accurate in terms of reading water temperature in your tank, something which is vital for keeping your fish alive.