For many people, it’s hard to maintain the right water temperature in your aquarium. Thus, it’s essential to measure its temperature properly. In order to track and adjust your tank’s temperature, you need a good thermometer. In this post, we will give you essential information for choosing the best aquarium thermometers. Also, we’ll share to you the best options on the market today.

Things to Consider When Choosing an Aquarium Thermometer

Thermometer types

They are available in many different types. You need to determine which thermometers do best for your aquarium. There are 3 main types of thermometers.

  • Stick on LCD Thermometer: They are commonly used in freshwater aquariums.
  • Floating/standing thermometer: These thermometers are common thermometers inside the aquarium. They offer users a direct measurement of water temperature.
  • Digital thermometer: this type comes with a probe placed in the tank. These products operate on batteries. Some of them can be plugged into the wall.

Easy to Use and Install

You need to purchase an aquarium thermometer that’s easy to set up. You have to place it in your tank. But, some electronic thermometers require a few extra steps.

Accuracy and Range

The most important things you concern is the accuracy. The product you choose needs to be accurate to within +/- degree Celsius. One of the important things is the range of temperature on the thermometers. It’s best to choose a range from 50-104 degree F.


Most of the thermometers are inexpensive. However, you should choose ones that can last and stay accurate. So, seek for ones that are made with long-lasting durable materials. When choosing a classic mercury thermometer, look for ones that don’t tend to crack or break. For electronic thermometers, look for ones with a probe attached to an LCD display.

Temperature Readability

You should prioritize to choose products that are easy to read for checking the temperature quickly. We recommend you to choose thermometers with LCD temperature display as well as a probe. In addition, you can consider buying mercury or color changing crystal thermometers. They can be able to work well.


Once you are choosing an aquarium thermometer, you should consider ones that offer the performance for all types of tanks. If you look for a thermometer for a small tank, you need ones that offer the best performance in various tanks.

The Benefits of an Aquarium Thermometer

The fact is that most fish require a specific water temperature so that they can stay alive as well as avoid diseases. That’s why you need to monitor the temperature in your tank. In fact, the temperature is not always 100% accurate. A thermometer will offer you a more accurate readout. Thanks to a thermometer, you can know when you need to heat or cool down the water for your inhabitant’s needs.

Best Aquarium Thermometers

If you are looking for a reliable and durable thermometer, let’s take a look at the following list.

Zacro LCD Digital Aquarium Thermometer

This thermometer is easy to read because of its large LCD display. It offers a suction cup, so you can easily monitor. This product is a good choice for those who are looking for an accurate readout. It comes with a temperature range from -50 to 70 degree C. In addition, this product is powered by one LR44 battery. Plus, it’s easy to replace and set up.

RISEPRO Digital Water Thermometer

This is also a great thermometer. It has an LCD display. So, you can easily read at a glance. Besides, the thermometer offers a submergible sensor probe for accurate temperature. It allows you to switch between degrees Celsius and Fahrenheit. Its temperature range is from -50 to 70 degrees Celsius. Moreover, it offers 2 suctions cups for a stronger hold. Plus, it’s easy to set up. You only need to do this in minutes.

HDE Digital Aquarium Thermometer

This unit also gives you a nice large LCD display with a probe. It’s easy to read and monitor the temperature in your tank. It has a wide temperature range from -50 to 70 degrees Celsius. It’s easy to switch from C to F. However, this product is not the most durable.

American Thermal Aquarium Thermometer

This product is a simple no fuss thermometer. It comes with no fancy LCD displays. It has sensitive color changing liquid crystals. They immediately show your tank’s temperature. In fact, it’s easy to read. Also, this thermometer is very easy to install. It allows you to remove as well as reposition without losing strength. This is an ideal choice for a small tank. However, it’s less accurate than the digital thermometers. And, it’s not perfect to use it for large tanks because it can be less accurate.

LCR Hallcrest A-1005 Liquid Crystal Aquarium Thermometer

This is a good choice for those who want a simple and basic thermometer. It has an easy tick peel and sticks design. Also, it has color changing liquid crystals. It’s easy to read thanks to the numerical display. It allows you to remove and reposition it. You should consider buying this product for small tanks. Furthermore, you won’t worry about any problems with algae list item. However, it’s not suitable to use on large tanks, since it can be less accurate.

CNZ Digital LCD Thermometer for Aquarium

It helps to maintain a stable temperature for your fish. This product doesn’t cost much. It allows you to monitor the temperature levels in your aquarium. This is a great choice for any tank. It’s easy to read. You can read it both in Celsius and Fahrenheit. It’s a durable product for a long-lasting performance. It has a replaceable battery. It’s made of high-quality materials. However, we can’t be sure about the durability of the screen.

KollerCraft TOM Temp Alert Digital Thermometer

If you are looking for a thermometer you can use in both freshwater and saltwater, you should consider buying the KolleCraft TOM Temp Alert Digital Thermometer. It offers a temperature range from 75-82 degrees F. It has suction cups, so you can stick it on the outside of the tank. In addition, it comes with a long 3-foot cord, so you easily place it. It provides you with accurate readings. Especially, the product comes with audible and LED notifications. It’s one of the most durable thermometers on the market today.

CoZroom LCD Digital Aquarium Thermometer

With this product, you can keep your fish in their best state. It features a clear LCD display, so you can read with ease. This thermometer is a compact and small product. Also, it’s easy to install. All you need to do is just attaching the display outside the tank. It’s made from a sturdy plastic material. So, it can last longer. Its temperature range is from -50 to 70 degrees. It can be able to work great in different environments. But, this option is not good for precision.

TOOGOO Digital LCD Fish Aquarium Thermometer

This is another great choice you can choose for your aquarium. It’s easy to use. It offers a wide temperature range from -50 to +70 degrees Celsius. It comes with a long sensor cable. So it’s not essential to have the device directly beside your tank. It offers an included battery. It has an LCD screen for reading with ease. However, there are some complaints about the quality.

Fluval Nano Thermometer

The fact is that most fish will love to be in temperature ranging below 76 degrees. So, getting the right thermometer is essential to keep your fish stay in the proper environment. This brand is one of the affordable units on the market today. This product is a slim and compact product. It offers an accurate result. It has a temperature range from 35 to 125 degrees F. It’s easy to read thanks to well-marked temperature markings. It also comes with suction cups, so you can easily install it. If you are looking got an affordable price thermometer, you should consider it.

Leegoal Digital Aquarium Terrarium Thermometer

This is the next thermometer you can choose for your aquarium. It’s designed with an external thermistor. It comes with a simple user interface. Therefore, you needn’t worry about any problems. It has an easy to read LCD display. So, you can easily read the temperature. In addition, it comes with a suction cup for placing it on a smooth surface. You only need to submerge the thermistor inside your fish tank. It allows you to switch from Celsius to Fahrenheit.

Marina Floating Thermometer with Suction Cup

If you are looking for a reliable and high-quality thermometer, consider choosing the Marina Floating Thermometer. It promises to give you the accurate temperature reading. You can easily read it in both Celsius and Fahrenheit. It comes with a suction up for people who want to attach it to the walls. There is no LCD display. Instead, it has a time-tested method to measure the temperature. This brand is considered to be one of the most accurate thermometers available on the market today. Plus, it comes with safety zone indicators that allow you to determine when the water is too hot or too cold for your fish.

Final Words

For every aquarium owner, it’s essential to get an aquarium thermometer. It helps to ensure the temperature in your tank. Also, you can adjust the temperature to suit your fish. Consult these above options. They’ve been tested for accuracy as well as durability. They promise to give you very accurate temperature readings.

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