12 best aquarium thermometers

Product description

With water temperature being such a critical factor for the well-being of fish, it’s important to have a good thermometer. The Marina Floating Thermometer is the perfect way to make sure the water temperature in your aquarium is just right for all your fish friends! This Marina Floating Thermometer is designed to float in the water in a vertical position. It comes with a suction cup for optional installation on your aquarium glass. Accurate and easy to read, it provides temperature readings in Centigrade and Fahrenheit. It also has a safety zone temperature range indicator for most tropical fish. For fresh or saltwater aquariums.For more fish tank accessories, check out the other Marina products including aquarium filters, filter media, aquarium heaters, aquarium air pumps, aquarium lights, aquarium thermometer, and aquarium stands. Marina has a wide variety of products that are perfect for your pet fish or betta fish to enjoy in any large fish tank, small fish tank or in a freshwater tank.

• Easy to read floating aquarium thermometer with suction cups
• Includes a safety zone indicator appropriate for most tropical fish
• Equipped with suction cups to attach to the side of your fish tank
• Ensures your aquarium is at the proper temperature
• Thermometer is 4.25 inches tall

User questions & answers

Question:	Can I take the suction cup off if I don't need it? Thanks
Answer:	Yes, the thermometer slides in and out through a hole attached to the suction tube. I take mine apart for regular cleaning.
Question:	Which part should be in the water? Can it be submurged fully
Answer:	The whole thing floats upright with just the top of the glass barely out of the water, and it seems to work just fine that way. I have mine fully submerged now and it works just the same. I'd imagine it's supposed to be at least mostly submerged from the way they designed it to float.
Question:	What exactly is the temperature range of the green safety zone of this product? Thanks
Answer:	the range is the 70 degrees about 70 to 80 f.
Question:	Someone says the thermometer suction cup left marks on there plastic aquarium and could not remove marks can anyone confirm if it will leave marks
Answer:	yes. ive had 2 acrylic tanks and both have rings on them, not only from this, but from heaters, betta leaves, food bowl, etc. anything you suction to an acrylic tank will leave a permanent ring

Product features

Marina Floating Thermometer with Suction Cup

With water temperature being such a critical factor for the well-being of fish, it’s important to have a good thermometer. This Marina Floating Thermometer is designed to float in the water in a vertical position. It comes with a suction cup for optional installation on your aquarium glass. Accurate and easy to read, it provides temperature readings in Centigrade and Fahrenheit. It also has a safety zone temperature range indicator for most tropical fish. For fresh or saltwater aquariums.

• Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water).
• Easy to apply suction cup and easy to read lcd screen; temperature readings to within 1 degree
• Large, easy to read lcd display; compact design for discrete use
• Temperature range -50 degree Celsius ~ + 70 degree Celsius; Operating temperature -10 degree Celsius ~ +50 degree Celsius.
• Powered by one lr44 button cell (included)

User questions & answers

Question:	Does this have a alarm
Answer:	No there is no alarm just a display and on and off switch
Question:	Can these reach above 100 degrees would be using for bearded dragon
Answer:	The item description says that the temp range is -50°C to 70°C, which is -58°F to 158°F.
Question:	Can you leave the probe in the tank without taking it in & out each time you want to spot check your tank temperature
Answer:	You have to leave it in the tank in order to get a proper temperature reading. Use the 2 suction cups to affix it to the side of your tank near the bottom or top back corner. That keeps it visible without obstructing the view.
Question:	how accurate is it
Answer:	These are the most accurate I've found yet, that's why I'll only buy this band for now on.

Product features

Zacro LCD Digital Aquarium Thermometer

Zacro Digital Thermometer features an easy to read digital display with temperature in either Fahrenheit or Celsius depending on your choice. The thermometer is accurate enough to create readings within 1 degree. Looking for a Thermometer for your Fish Tank? Our Digital Thermometer is a good choice for you!

Small Volume

Its size shows as the picture:

Thermometer size: 2.17 x 1.46 in

Cable length: 24.88 in

Probe: 1.57 in

Battery

Each thermometer is equipped with a LR44 battery. Open the battery cover and insert battery with (+) positive side up. The LCD will now display the current room temperature.

Operation

1. Attach the display unit to the outside of the tank using the suction cups and submerge the probe into the water in the tank.

2. Press and hold the power (PWR) button to turn on. Hold the power button for 3 seconds to turn off.

Details

Package Contents:

2 x Battery

2 x Digital Thermometer

2 x Probe

Wide application

Zacro Digital aquarium thermometers can be used for aquariums and fish tanks such as fresh water, tap water, salty water, marine water and etc. It can help you to monitor the water temperature of your fish tank so that you can make proper adjustments to it, which can protect fish from diseases. What's more, two thermometers can be used for replacement, so you can monitor the water temperature at all times.

• Small volume, large function: The size of thermometer is 2.17 x 1.46 in. Our thermometer is suitable for different water types such as fresh water, tap water, salty water, marine water and etc.
• Convenient: You can choose seither Fahrenheit or Celsius according to your need. What's more, each thermometer is equipped with a LR44 battery.
• Show clearly temperature: You can read the temperature data clearly in the LCD screen. Please note that the thermometer reading has about 1 degree deviation.
• Easy to use: Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water).
• Temperature range: -50 degree Celsius~ + 70 degree Celsius; Operating temperature: -10 degree Celsius~ +50 degree Celsius.

User questions & answers

Question:	Can the probe stay submerged indefinitely
Answer:	Mine has been submerged for a month and is still perfect. It is designed to be in the water at all times.
Question:	probe cable length
Answer:	The "cable" is a thin wire. Mine is 36 1/2 " from thermometer to probe. It is quite accurate for the price. I'm happy with it. Enjoy your aquarium.
Question:	does this work on snake tanks
Answer:	Some times mine works out of the water, but I would not rely on it.
Question:	How long do the batteries last about
Answer:	I have had this unit for about 4 months and so far so good

Product features

Zacro LCD Digital Aquarium Thermometer

Zacro Digital Thermometer features an easy to read digital display with temperature in either Fahrenheit or Celsius depending on your choice. The thermometer is accurate enough to create readings within 1 degree. Looking for a Thermometer for your Fish Tank? Our Digital Thermometer is a good choice for you!

Small Volume

Its size shows as the picture:

Thermometer size: 2.17 x 1.46 in

Cable length: 24.88 in

Probe: 1.57 in

Battery

Each thermometer is equipped with a LR44 battery. Open the battery cover and insert battery with (+) positive side up. The LCD will now display the current room temperature.

Operation

1. Attach the display unit to the outside of the tank using the suction cups and submerge the probe into the water in the tank.

2. Press and hold the power (PWR) button to turn on. Hold the power button for 3 seconds to turn off.

Details

Package Contents:

1 x Battery

1 x Digital Thermometer

1 x Probe

• 🐌🐌 Cordless & Touch Screen Design : no probes or messy wires in water and backside temperature sensor stick on the outside glass of the fish tank prevent water infiltration and electronic Oxidation, Large Crystal Touch Screen makes it easier to read the temperature far away, stands out among other aquarium thermometers.
• 🐌🐌 Large numbers on 3.2" Large Transparent Screen : 3.2" large glass screen is larger than most of the thermometers, large temperature display on transparent screen, will not block your view.
• 🐌🐌 Accurate Display : With an accurate temperature sensor stick on the surface of the fish tank, this Digital aquarium thermometer will display temperature for fish tank, reading from 0°C to 70°C / 32°F - 158°F, accurate to 0.1°
• 🐌🐌 Easy to Operate : pull down the black battery cover below the screen, insert the battery, close it, stick and read the tank temperature. Press "up" or "down" to switch °C / °F
• 🐌🐌 Widely used : Suitable For Different Water Types Such As Fresh Water, Tap Water, Salty Water, Marine Water And Monitors The Living Temperature For Reptile Such As Lizard, Turtle.Also, it can be used for DIY Brew Beer and wine barrel, Terrarium, Greenhouse, Vivarium and any sort of pet tank thermometer.

User questions & answers

Question:	Is this just measuring the outside air temperature? It doesn’t match my thermometers with a water probe and I don’t think it’s reading water temp
Answer:	The part that reads temperature is pressed up against the tank glass. Which means in actuality it is reading the tank temperature. It’s not unusual to have different thermometers be a degree or two off. I am not an expert but I would rate this thermometer is the most accurate that I’ve ever owned
Question:	The large temperature is flashing, is that ok
Answer:	Flashing is warning you that the current temperature is higher than the highest temp you set or lower than the lowest te, you set. if you want it to stop flashing, just set the left small number greater than the current temp and the right small number less than the current temp. Here is the step: first short press the "fish" the left small number will flash, then press "up" to make it greater than the current temp, then short press "fish", the right small number will flash, then press "down" to make it less than the current temp. Done.
Question:	Is this an aquarium or terrarium thermometer? Or both
Answer:	Dear friend, Both. It is aquarium thermometer , when you use it to monitor fish tank temperature, pls stick it on the outside of the tank, make the sensor beneathe the water level. It also can be a terrarium thermometer, if there is water in your tank, pls use it as same as aquarium thermometer, outside and beneath the water level. if no water in the tank, you can stick it on the inside to monitor the inside temperature.
Question:	How does unit attach to glass
Answer:	The unit has a sticky back which adheres to the glass. You can remove it, but it doesn't come off easily.

Product features

Transparent clear screen

This Aquarium Thermometer comes with Transparent Clear Screen, makes it a pleasing event to watch your lovely fishes, it is also a perfect decoration for your tank.

Touch to set functions

Touch to set high temperature warning and low temperature warning.

Backside temperature, no messy wires

Backside Temperature sensor monitors water temperature accurately, will not suffer from water infiltration and electronic components corrosion , No messy wires in water makes you tank unique and beautiful.

How to set the flash function ?

Press the “set” key, the first small number will flash, short press “up” or “down” to set up the highest temperature you want it to flash, then press “set”, the other small number will flash, short press “up” or “down” key to set up the lowest temperature. Done.

Note: If you replace the battery, this thermometer will be back to C and default high / low temperature flash point is 30 C / 20 C, pls set up a high enough temperature and a low enough temperature If you do not want it to flash.

• HIGH ACCURACY: Temperature Range: -50℃ ~ +70℃ (-58 °F ~ +158 °F); This aquarium thermometer is accurate to +/- 1℃, no matter whether the probe is placed in any corner of this fish tank, an accurate temperature will be displayed
• LCD DISPLAY: Comes with a large LCD display that is easy to read clearly and accurately
• ADJUSTABLE UNIT TEMPERATURE: Easy to adjust the temp between Fahrenheit and Celsius displays; Long-press the power button to adjust the unit display
• TWO SUCTION CUPS: Equipped with two suction cups, one for attaching the cable to the side of the tank and another for attaching the thermometer
• SUPER LONG CABLE: The cable length connected to the probe is 78.74 inch (2 m) superior to 23.62 inch (60 cm) standard cable length; Allows accurate temperature measurements in even the largest fish tanks

User questions & answers

Question:	Will this work for salt water
Answer:	yea it will
Question:	What size button battery
Answer:	LR44
Question:	Would this work for a reptile tank
Answer:	Yes they are very accurate inside a dry or water fish aquarium. They would actually work well anywhere as a thermometer inside your home, outside porch, your car. Just keep the device dry. The probe connected to the wire of course can get wet. Again, very accurate temperature reading at a great price.
Question:	Is the probe accurate for air temperature readings to +/- 1 degree as well? It's marketed as a fish tank (liquid?) Thermometer
Answer:	We use them for air temperatures (RV fridge and ambient) and find they work great.

Product features

VIVOSUN LCD Digital Thermometer

VIVOSUN's digital aquarium thermometer is designed for monitoring and checking the water temperature of fish tanks. With a large LCD display to help you easily read your measurements and a compact and durable design, you’ll find tons of opportunities to use it. It is a perfect match for your aquarium.

Notice:

1. If you want to turn the device off, please press the power button for 3 seconds.

2. Do not submerge the thermometer into the fish tank.

Large LCD Screen

• Large, easy to read LCD display
• Celsius degrees Fahrenheit freely switch

Durable Battery

Equipped with one LR44 button battery to supply electricity, which is durable and replaceable and can be long-term used

2 Suction cups

One is a fixed thermostat and the other is a fixed probe

Waterproof Probe

Comes with a high-quality probe that works well underwater without corroding or breaking

Product description

The Fluval Edge Digital Aquarium Thermometer is accurate and easy to read. It ranges 64 to 86 degrees Fahrenheit, and comes with an adhesive backing which makes it easy to mount to the outside glass. The Fluval Edge Digital Aquarium Thermometer is a great way to maintain the proper temperature for your aquarium, ensuring that your inhabitants are living in a comfortable environment.

• accurate and easy-to-read thermometer
• mounts easily on outside of glass
• ideal for fresh and saltwater tanks
• temperature range of 64 to 86 degrees fahrenheit
• Age range description: All ranges

User questions & answers

Question:	Can this be used on a hermit crab glass tank
Answer:	Its ok
Question:	Can it be used on plastic tanks
Answer:	Yes you can use it it plastic aquariums/tanks.
Question:	This thermometer appears to display temperature in 3 degree increments. How much temp. variation can fish (tetras) tolerate w/o stress
Answer:	don't know but you can google it
Question:	Do you know what "Digital" means
Answer:	It should read numerical, not digital.

Product description

Features:

Wide Application: Ideal for use in water or high moisture environment like aquarium terrarium, or vivarium, suitable for different water types such as fresh water, tap water, salty water, marine water and etc.

Easy to Read: Comes with a large LCD display that is easy to read clearly.

Easy to Setup: Submerge probe with suction cup can easily be set in water. (Submerge probe only, do not submerge thermometer in water) Press ''PWR'' for 3 seconds to power off.

Free Extra LR44: 2 PCS LR44 button cell for each thermometer (one for operation, one for spare).

Wide Temperature Range: Measure -58°F to +158°F (-50°C to +70°C) with accuracy +/- 1°C.

Two Suction Cups: Equipped with two suction cups for each thermometer, one for attaching the cable to the side of the tank and another for attaching the thermometer.

Dimension:

Thermometer size: 2.3" (L) x 1.5" (W)

Cable length: 3 ft

Package includes:

6 pcs Digital Thermometers

12 pcs LR44 Button Cell (one for operation, one for spare)

12 pcs Suction Cups

• Wide application: Ideal for use in water or high moisture environment like aquarium terrarium, or vivarium; suitable for different water types such as fresh water, tap water, salty water, marine water and etc
• Easy to read: Comes with a large LCD display that is easy to read clearly
• Easy to setup: Submerge probe with suction cup can easily be set in water (Submerge probe only, do not submerge thermometer in water) ; Press ''PWR'' for 3 seconds to power off
• Free extra LR44: 2 PCS LR44 button cell for each thermometer (one for operation, one for spare)
• Wide temperature range: Measure -58°F to +158°F (-50°C to +70°C) with accuracy +/- 1°C

User questions & answers

Question:	Is this only for water
Answer:	Yes, it can only be used to read the water temperature, thank you.

Product description

Why Need To Monitor Aquarium Temperature ?

★ Most aquatic don't regulate internal body temperature but rather they rely on their environment

★ Improper temperature can lead to inadequate growth, respiratory or cardiac paralysis, and possibly death of aquatic

★ A sudden decrease in temperature can hurt a pet's immune system and raise the risk of it getting sick

★ Sudden increases in temperature can lead to a spike in metabolic activity,a shock to respiratory system, and coral bleaching



How To Install This Adhesive Thermometer Strip?

Step 1 Clean dry the outside glass of the aquarium

Step 2 Peel off the plastic backing from the thermometer strip

Step 3 Stick-on the strip against the outer wall of aquarium.Be sure to stick below the water level,the lower the better

Step 4 Look for the strip after 2 to 5 minutes. The colored indicates the exact temperature



Package：

4*Aquarium Thermometer Strip

• ★ Displays Degree Centigrade Fahrenheit ★ The thermometer strip has a range of 39℉ to 97℉ and 4℃ to 36℃. The large numbers are Fahrenheit and the small numbers are Centigrade
• ★ Easy To Stick On ★ The Simply pulled the backing off to reveal the adhesive back and applied to the front of your fish tank/aquarium/carboy/jar/fermentation bucket. Great way to keep a quick eye on your fish tank/wine jar/kombucha temp
• ★ Easy To Read ★ The thermometer strips is a piece of temperature sensitive paper.The colored marking shows the current temperature. If show multi-color,please choose the average value
• ★ Kindly Tips ★ The best kombucha brew temp is 78℉ to 85℉.Keep your betta’s water between 78℉ to 80℉
• ★ 100% Satisfaction★ We aim to provide the highest quality service and the best product quality for each customer. Place your order without any worry. If you have any question, please feel free contact us. We will unconditionally solve for you!

User questions & answers

Question:	How are the themperature determined
Answer:	The colored marking shows the current temperature, it's at so it's easy to read. The color will move and change as the temperature changes.
Question:	Can I stick this to a flowerpot to read air temp
Answer:	You can try, it was originally to read the temperature of the aquarium
Question:	I am still not clear on how to read these. Sometimes only one number is colored, sometimes 3 are. What do the colors mean? Is that a range
Answer:	As far as I know, the number with the brightest color is closest to the true temperature. Since the numbers jump degrees there are usually a couple colors showing and If show multi-color,please choose the average value.
Question:	How long does one strip last
Answer:	I’ve been using my first one for a few month on my fermentation buckets for homebrew beer and it still seems to work.

Product description

Features:

Wide Application: Ideal for use in water or high moisture environment like aquarium terrarium, or vivarium, suitable for different water types such as fresh water, tap water, salty water, marine water and etc.

Easy to Read: Comes with a large LCD display that is easy to read clearly.

Easy to Setup: Submerge probe with suction cup can easily be set in water. (Submerge probe only, do not submerge thermometer in water) Press ''PWR'' for 3 seconds to power off.

Free Extra LR44: 2 PCS LR44 button cell for each thermometer (one for operation, one for spare).

Wide Temperature Range: Measure -58°F to +158°F (-50°C to +70°C) with accuracy +/- 1°C.

Two Suction Cups: Equipped with two suction cups for each thermometer, one for attaching the cable to the side of the tank and another for attaching the thermometer.

Dimension:

Thermometer size: 2.3" (L) x 1.5" (W)

Cable length: 3 ft

Package includes:

1 pc Digital Thermometer

2 pcs LR44 Button Cell (one for operation, one for spare)

2 pcs Suction Cups

• Wide application: Ideal for use in water or high moisture environment like aquarium terrarium, or vivarium; suitable for different water types such as fresh water, tap water, salty water, marine water and etc.
• Easy to read: Comes with a large LCD display that is easy to read clearly
• Easy to setup: Submerge probe with suction cup can easily be set in water (Submerge probe only, do not submerge thermometer in water) ; Press ''PWR'' for 3 seconds to power off
• Free extra LR44: 2 PCS LR44 button cell for each thermometer (one for operation, one for spare)
• Wide temperature range: Measure -58°F to +158°F (-50°C to +70°C) with accuracy +/- 1°C

User questions & answers

Question:	Is the Display water resistant or will it get ruined when it rains
Answer:	i think it's water resistant but .i have read out on the outside of my tank, read the packaging
Question:	How do i adjust the temperature? Its reading 10 degrees cooler than actual temp
Answer:	Hello, sorry to hear about that, you could change the battery to try if there is any help? And if it still doesn't work correctly please contact us, we could send you replacement for use, thank you.
Question:	Will this work for my bearded dragons 55 gallon tank? Also, should I buy 2? One for the basking side and one for the UVB side
Answer:	Yes it will work. But to get a more accurate reading two would work better for different areas.
Question:	It’s stuck on “Hi” right out of the box. Turned on and back off still says “Hi
Answer:	It is a water thermometer. It should only be turned on when the probe is in the water, per the directions that came with the device. I am not sure what your question is? Mine works perfectly fine for the fish tank I use it in.

Product description

LCR Hallcrest A-1005 Liquid Crystal Vertical Aquarium Thermometer

• Easy To Read
• Mounts Vertically On The Outside Of Your Aquarium
• Easily Movable

User questions & answers

Question:	Does this need electricity
Answer:	Hi, Electricity is not needed. No batteries are required. This product uses thermochromic technology. Quickly and easily mounts externally on your tank. No mess, no fuss.
Question:	For those whose thermometers are accurate- can you tell me please if u have glass aquariums? My thermometer reads 3 degrees lower than the temp inside
Answer:	I find it acurate on the outside of a plastic aquarium
Question:	Can this thermometer be mounted horizontally, or does it have to be vertical
Answer:	It is designed to be easily read in the vertical position. There are horizontally mounted thermometers located here. https://www.amazon.com/gp/offer-listing/B01203HWPA Hope that helps.
Question:	Since this reads from the outside, are there limitations on how thick the aquarium glass can be
Answer:	No. It just sticks to the outside!

• 20 value set, 10 piece of Horizontal version and 10 piece of vertical version, meet your multiple needs.
• Dimensions: 5.1 x 0.7 inch / 13 x 1.8 cm
• The thermometer strip has a range of 64℉ to 93℉ and 18℃ to 34℃, the large numbers are Fahrenheit and the small numbers are Centigrade.
• Easy to use, simply peel off the backing off and attach the thermometer sticker to the outside surface of aquarium, fish tank, wine jar, fermentation bucket and so on, works for fermenting kombucha, lagers and ales, one time use.
• Responsive and easy to read, it will shows different color with different temperature, if it show multi-color, please choose the average value.

Product features

GUOOU Aquarium Thermometer Sticker, Stick On Brewing Thermometer Strip

20 value set thermometer sticker, 10 piece of Horizontal version and 10 piece of vertical version, meet your multiple needs. The thermometer strip has a range of 64℉ to 93℉ and 18℃ to 34℃, easy to use, works for fermenting kombucha, lagers and ales, it will shows different color with different temperature, if it show multi-color, please choose the average value.

Product description

The unique design of the JW pet company smarttemp thermometer combines a thermometer with a magnet. The smart temp thermometer goes on the inside of the tank and the magnet goes on the outside to hold the smarttemp firmly in place, no suction cups needed. The smarttemp also offers a green safe zone which indicates the optimal temperature range. A high-end accuracy- (+/-) 1.5-degree f and the smartt emp has la rge easy to read numbers.

• In-tank thermometer is secured with magnet outside the tank
• No suction cups needed
• Green safe zone indicates optimal temperature range
• Large easy to read numbers

User questions & answers

Question:	DOes this thermometer contain mercury or alcohol
Answer:	I don't know for certain what the thermometer contains. However, one thermometer broke inside the tank, and it was in there for several hours before I noticed it. There was no harm to the fish at all. I'm assuming that harm to your fish is the reason for your question, so I hope this tells you what you need to know.
Question:	Can the fins be taken off in case I want it to float
Answer:	No. The glass tube is glued to the weighted base.
Question:	Would this thermometer still work effectively outside the water
Answer:	I could see it working for air temperature as well I don't see why it wouldn't work
Question:	Would the standing version place at the center of the tank be more accurate than a magnet one on the side
Answer:	Depends if you place it near your heater or not this is accurate placed on the opposite side

Product features

About US

JW pet products are intelligently designed to improve the lives of pets and pet parents. With JW, pet products go beyond the obvious and search for the newest innovation. Every product from JW is the result of hands-on product research and development.