Editor's Choice - Our Favorite Kordon Aquarium Thermometers

1. KORDON #37444 Malachite for Aquarium, 4-Ounce, Green

User Ratings: 74 4

Kordon 479042 First Impressions

"Just received it today."

And for the price you cant beat it. 6F all six took about three minutes to read between 88. I removed the batteries of the units I wasn't using right away. It works equally well on all of them. My 50+ eyes cannot read a regular tank thermometer without squinting. I read some of the 1 star reviews and most of them are not about the product. It is easy to use and install it'disappears' in your tank it is so unobtrusive.

  • KORDON #37444 Malachite for Aquarium, 4-Ounce, Green
  • Kordon malachite green 4oz
  • Malachite green is also effective against common external fungi infections of fishes and eggs
  • Malachite green is an effective medication used for the control of various external parasites
  • Manufacture: TopDawg Pet Supply
  • Product Dimensions: 0.02 x 0.02 x 0.02 inches; 0.32 Ounces
  • Editor's Impressions Of The Kordon 479042
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='4.7']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

Kordon 479042 Final Thoughts

"This is perfect."

You dont HAVE to stick the display onto your tank. 82 PER THERMOMETER with battery included. I did have a problem with one in my first pack of 6. Set all six probes up in a terrarium with a constant temp of 88. My only complaint is that they tend to be a one time use. I have always had trouble reading the color temp. Was going to get a floater until I saw this magnetic one!

Overall Score
4.5

[star rating="4.5"]
(164 Points)

Peoples Choice - Other Highly Rated Kordon Aquarium Thermometers

2. KORDON #39844 Rid Fungus for Aquarium, 4-Ounce

User Ratings: 52 26

Kordon MODEL-39844 First Impressions

"9, and 78."

This little wonder allows me to see at a glance that everything is as it should be. So far, they're all doing their job in my four tanks and I am quite content. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. The only reason I didn't give this 5 stars is because my betta fish didn't like it. The digital display is nice and small as well. So, in those cases, I find it easier to simply replace it. Set all six probes up in a terrarium with a constant temp of 88.

  • KORDON #39844 Rid Fungus for Aquarium, 4-Ounce
  • Kordon rid fungus 4oz
  • Kordon prevent ich is a strong preventative
  • Also serves as an effective external treatment of protozoans, din flagellates and fungi
  • Manufacture: KORDON LLC
  • Product Dimensions: 0.02 x 0.02 x 0.02 inches; 0.32 Ounces
  • Editor's Impressions Of The Kordon MODEL-39844
  • Thermometer Accuracy [star rating='4.3']
  • Quality [star rating='3.3']
  • Value For Money [star rating='4.3']
  • Affordability [star rating='2.6']

Kordon MODEL-39844 Final Thoughts

"Fish are doing very well."

You dont HAVE to stick the display onto your tank. Works well in my betta tank, but provide a couple hours for it to read temp changes. I have mine on my 60 gallon cube marine tank. You can not swivle the thermometer to face a certain way. I'm pretty sure those reviewers have acrylic tanks. I used to have a large hang in the side tank that you couldn't miss. My 50+ eyes cannot read a regular tank thermometer without squinting.

Overall Score
3.5

[star rating="3.5"]
(6 Points)

3. IS Icstation Digital Thermometer, Car Auto Temperature Gauge Sensor, DC 4-28V Fahrenheit Dual Displa...

User Ratings: 62 11

IS 13649 First Impressions

"Very easy to read."

Only thing I don't love is how long the cord is. I got root rot after light leaks and high water temps. Since adding one of these, it has been much easier to monitor the temp of my tanks. A battery can last you up to six months, I'd say, but expect more like three. You can glue, tape or simply cover the cords in the tank to keep them discreet. Then she followed up again on that, asking if they had arrived and were okay. I think the people who said the suction cup broke.

  • IS Icstation Digital Thermometer, Car Auto Temperature Gauge Sensor, DC 4-28V Fahrenheit Dual Display, Monitor with 2 NTC Waterproof Probes for Aquarium Vehicle Fish Tank
  • NTC WATERPROOF PROBES - This aquarium thermometer uses high-precision NTC waterproof metal sensor probes to measure the water temperature of the aquarium.
  • DUAL SENSOR PROBES - Comes with 2 probes, enabling the thermometer to test the temperatures of two different places. For example, measuring the temp of indoor&outdoor or two different tanks at the same time.
  • RED&BLUE DISPLAY - Icstation temp sensor uses a HD LCD display to let you know the Fahrenheit temperature of the fish tank in real time, thus providing a healthy and comfortable water environment for your lovely fishes. The clear red and blue display makes it easy to read temperatures no matter in bright and dark.
  • WIDE TEMP RANGE - Temperature Range -58 ℉ ~ +257℉(Fahrenheit); Temperature measurement accuracy: ±1℉ (±0.1℉ when temperature within -9.9~99.9F). It can be not only used in water but also used to measure the air temperature. But the water temperature will be more accurate than that of air.
  • 3 FEET WIRES - With 1 meter long wires, it is flexible to place the 2 sensor probes in aquarium tank, fish tank, reptile terrarium, refrigerator, brooders, vehicle or any other place that requires monitoring of temperature.
  • ICStation has 9 years experience on electronic industry products
  • Welcome to ask for discount for bulk purchase
  • Provide technical assistance
  • Manufacture: icstation
  • Editor's Impressions Of The IS 13649
  • Thermometer Accuracy [star rating='3.3']
  • Quality [star rating='3.6']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.3']

IS 13649 Final Thoughts

"This is perfect."

Then she followed up again on that, asking if they had arrived and were okay. We are using them to measure various temperatures inside and outside of a motorhome. So versatile, I can read the temperatures literally anywhere. The plastic from the suction cup quickly turned from a clear to a milky white. Still a recommendation for me due to price and accuracy. Since it is a mercury thermometer, it is very accurate. So, in those cases, I find it easier to simply replace it.

Overall Score
4.1

[star rating="4.1"]
(105 Points)

4. Imagitarium Glass Thermometer, Small

Imagitarium First Impressions

"Which is good."

SIX Digital Thermometers with SIX batteries INCLUDED working so well. It started working as soon as I put it in and has been working ever since. I recommend gluing the suction cups in place where needed for long-term installation. SIX Digital Thermometers with SIX batteries INCLUDED working so well. Instead she sent a new package of two, both of which work. It started working as soon as I put it in and has been working ever since. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK.

  • Imagitarium Glass Thermometer, Small
  • Glass Thermometer from Imagitarium
  • Measures water temperature in Celsius and Fahrenheit
  • Attaches to the inside of your aquarium with the included suction cup
  • Safety zone indicator monitors ideal temperatures for most tropical fish
  • Safe for freshwater and saltwater environments
  • Manufacture: Imagitarium
  • Item Weight: 0.48 ounces
  • Editor's Impressions Of The Imagitarium
  • Thermometer Accuracy [star rating='3']
  • Quality [star rating='2.6']
  • Value For Money [star rating='2.3']
  • Affordability [star rating='3.5']

Imagitarium Final Thoughts

"Buy these."

These things are useful for a lot besides pet husbandry, too. In this scenario it would probably get knocked loose a lot. 2 deg, if it was 32, it would be a SOLID block of ice. I guess these units do not like saltwater. I just wrote it off as a minor loss. The units each had a battery in place and situated for immediate use. I am extremely pleased with this product.

Overall Score
3.0

[star rating="3"]
(1 Points)

5. Amagle Indoor Digital Thermometer Aquarium Submersible Fish Tank Terrarium LCD Digital Thermometer

User Ratings: 51

Amagle YG_DMH002 First Impressions

"Or left a mark."

I had my heater set at 73-degrees and the thermometers showed 74. 50 thermometers, reads much easier and no suction cup residue, also looks better. One extra battery came with each unit. 89 I could buy Six Thermometers with Six included batteries. The units each had a battery in place and situated for immediate use. 6F all six took about three minutes to read between 88. I can't say which is the most accurate and don't really care.

  • Amagle Indoor Digital Thermometer Aquarium Submersible Fish Tank Terrarium LCD Digital Thermometer
  • Celsius or Fahrenheit selectable
  • Measure both tank and indoor temperature
  • Large LCD display simultaneously showing aquarium & ambient temperature
  • With adhesive tape at back side for easy sticking on aquarium tank
  • Sensor at the back of the thermometer to measure water temperature from glass. Therefore, normally it would measure 1 degree higher than actual water
  • Manufacture: Amagle
  • Item Weight: 1.1 pounds
  • Product Dimensions: 5.51 x 3.15 x 0.39 inches
  • Editor's Impressions Of The Amagle YG_DMH002
  • Thermometer Accuracy [star rating='3.7']
  • Quality [star rating='4.8']
  • Value For Money [star rating='3.5']
  • Affordability [star rating='3.1']

Amagle YG_DMH002 Final Thoughts

"It's accurate I tell you."

Only thing I don't love is how long the cord is. The digital display is nice and small as well. I have kept aquariums for about 45 years. I ordered this guy and it was 6 degrees hotter than the digital! The units each had a battery in place and situated for immediate use. If the digital display starts to get dim, it's time for a new battery. I got root rot after light leaks and high water temps.

Overall Score
4.0

[star rating="4"]
(3 Points)

6. HEEPDD Reptile Thermometer Hygrometer, Mini Round Shape Dual Dial Thermometer and Humidity Gauge for...

User Ratings: 41 34

HEEPDD First Impressions

"LOVE these thermometers."

I have kept aquariums for about 45 years. The suction works for a month at a time- in pool and hot tub circulation. I used to have a large hang in the side tank that you couldn't miss. Ambient room temperature measures 72. Now if it falls into a sink full of water, it's not a problem. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. I used these on a number of my aquariums that have discus fish in them.

  • HEEPDD Reptile Thermometer Hygrometer, Mini Round Shape Dual Dial Thermometer and Humidity Gauge for Reptile Tank Lizard Tortoise Spider Chameleon Pet Rearing Box
  • 2 in 1 Design---Monitoring of temperature and humidity is essential in providing any reptile species with the correct environment. Adopt the principle of physical measurement, no maintenance needed, and no battery required.
  • Easy to Read---Large dual round dial with accuracy scales, easy to read. Temperature Measuring Range: -30-50°C, Humidity Measuring Range: 0-100%RH. Use different color coded segments for easy reading, blue means cold (humid), green means moderate, red means hot (dry).
  • Compact and Lightweight---The thermometer can be suspended level or placed on the use, can be displayed anywhere in the reptile habitat without getting in the way of your pal’s view.
  • Applicable Scenes---Widely used for lizard, tortoise, spider, chameleon in vivariums, hatchers, brooders, propagators, etc. Also suitable for pet, warehouse, hospital, laboratory, air-conditioned room, etc.
  • Satisfaction Guarantee---We greatly value our customers and want you to be completely satisfied with your purchase. If you aren't happy with your shopping experience or product, we urge you to contact us so we can resolve the issue!
  • Manufacture: HEEPDD
  • Product Dimensions: 6.1 x 2.95 x 0.59 inches; 2.12 Ounces
  • Editor's Impressions Of The HEEPDD
  • Thermometer Accuracy [star rating='3.7']
  • Quality [star rating='2']
  • Value For Money [star rating='3.5']
  • Affordability [star rating='3.6']

HEEPDD Final Thoughts

"I like this."

One extra battery came with each unit. I was using one of those ubiquitous cheap digital thermometers on Amazon. For something so cheap, they are working remarkably well. Then is started to give a low reading, and it is not reading the correct temperature. These digital thermometers are great and there is no guesswork involved. This little wonder allows me to see at a glance that everything is as it should be. So, in those cases, I find it easier to simply replace it.

Overall Score
3.0

[star rating="3"]
(11 Points)

7. Aquarium Submersible Glass Thermometer With Suction 14Cm Hydrometer Waterproof Fish Tank Durable

User Ratings: 59

Fashion Life First Impressions

"Great for price."

He was moving slow in the winter and we realized he needed a heater! Place it on your aquarium and you are good to go. One being a very expensive digital. When and if we run out of this batch, I'll instantly order another batch. So this is the extreme end of the high temperature range. So, in those cases, I find it easier to simply replace it. He was moving slow in the winter and we realized he needed a heater!

  • Aquarium Submersible Glass Thermometer With Suction 14Cm Hydrometer Waterproof Fish Tank Durable
  • Aquarium and exo terra reptile tank thermometer.
  • Made of high quality glass, clear and easy to read.
  • Stable and durable enough for a long time use.
  • Manufacture: Fashion Life
  • Editor's Impressions Of The Fashion Life
  • Thermometer Accuracy [star rating='4.4']
  • Quality [star rating='3.5']
  • Value For Money [star rating='3.5']
  • Affordability [star rating='4.8']

Fashion Life Final Thoughts

"Love it for my turtles."

49 thermometer that is 100% accurate. Personally I do not mind the way it looks in my aquarium. 50 thermometers, reads much easier and no suction cup residue, also looks better. I used to have a large hang in the side tank that you couldn't miss. I bent it a little bit and when I put it back it was perfectly fine. I am extremely pleased with this product. 89 I could buy Six Thermometers with Six included batteries.

Overall Score
4.2

[star rating="4.2"]
(4 Points)

8. Suisaku Magnetic Glass Thermometer L (L)

User Ratings: 59 7

Suisaku First Impressions

"Easy to setup in tank."

So much so that I purchased a second set of 6. Now that the chickens are grown, I have one out in the coop as well. So far, they're all doing their job in my four tanks and I am quite content. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. They are within a degree or two of other thermometers I've checked to compare them. I was using one of those ubiquitous cheap digital thermometers on Amazon. 82 PER THERMOMETER with battery included.

  • Suisaku Magnetic Glass Thermometer L (L)
  • Magnetic attachment
  • Large Display
  • Slim Profile
  • Less than 11 cm (4.33 inches) in length
  • Manufacture: Suisaku
  • Product Dimensions: 0.39 x 0.39 x 4.92 inches; 0.78 Ounces
  • Editor's Impressions Of The Suisaku
  • Thermometer Accuracy [star rating='4.4']
  • Quality [star rating='4.5']
  • Value For Money [star rating='3.3']
  • Affordability [star rating='3.3']

Suisaku Final Thoughts

"So far so good."

For the price I'll probably end up putting these in all of my aquariums. So far, they're all doing their job in my four tanks and I am quite content. The suction cups work well anywhere I have placed it it has not Fallen. Bought the two pack of thermometers. You can use the thermometer with or without the plastic suction cup. The temperature fluctuated a lot with it. The digital display itself is easy to read at a glance.

Overall Score
4.1

[star rating="4.1"]
(70 Points)

9. Tzou Aquarium Thermometer, Aquarium Waterproof Hydraulic Gauge Submersible Glass Thermometer with Su...

Tzou First Impressions

"Really easy to hook up."

One being a very expensive digital. When and if we run out of this batch, I'll instantly order another batch. I don't think they are backlit but for the price they are still nice. Only thing I don't love is how long the cord is. The lid is textured aluminum, and the suction cups don't stick to that. We are using them to measure various temperatures inside and outside of a motorhome. The units each had a battery in place and situated for immediate use.

  • Tzou Aquarium Thermometer, Aquarium Waterproof Hydraulic Gauge Submersible Glass Thermometer with Suction Cup 14CM
  • Package - You will get 1/2/5 pack Aquarium Thermometer, enough for several aquariums.Aquarium Waterproof Hydraulic Gauge Submersible Glass Thermometer with Suction Cup.
  • Material - Made of clear glass tube and PVC suction cup for Aquarium Thermometer, good quality and durable, Waterproof ,packaged in blister, providing from breaking during transportation
  • Function - Red indicator line let you read the temperature quickly and easily, temperature ranges from 0-50℃。
  • Come with suction cup, which can suck the aquariums wall tightly
  • Widely application: you can put it in your pool, pond, fish tank, aquariums, etc
  • Manufacture: Tzou
  • Item Weight: 0.63 Ounces
  • Editor's Impressions Of The Tzou
  • Thermometer Accuracy [star rating='5']
  • Quality [star rating='4.7']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

Tzou Final Thoughts

"I like these."

It's kind of difficult to hide and keep out of the way. I don't think i'll ever be able to trust a digital thermometer again. All are pretty accurate within one degree as claimed. I find that the temps are accurate, and this product gives added peace of mind. It is my opinion that everyone should have these that are in the Aquarium Hobby. Water tested with Autidefy brand for two hours. I bent it a little bit and when I put it back it was perfectly fine.

Overall Score
5.0

[star rating="5"]
(1 Points)

10. AUTIDEFY LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature (2Pack+10Pack)

User Ratings: 50 11

AUTIDEFY First Impressions

"Only thing the battries."

In this scenario it would probably get knocked loose a lot. Water tested with Autidefy brand for two hours. For the price I'll probably end up putting these in all of my aquariums. One of my aquariums is glass, and the other two are plastic. I got root rot after light leaks and high water temps. It is my opinion that everyone should have these that are in the Aquarium Hobby. I can't say which is the most accurate and don't really care.

  • AUTIDEFY LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature (2Pack+10Pack)
  • Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water)
  • LED Digital °C /° F thermometer;Temperature range -50°c ~ + 70°c,Operating temperature -10°c ~ +50°c
  • Sticker Thermometer Dimensions: 5.12” tall by 0.7” wide (13cm x 1.8cm)
  • Adhesive on the back, just peel off the tape and attach to the outside surface.
  • Package Contents: 2 x Digital Thermometer; 10 x Stick-on Thermometer
  • Manufacture: AUTIDEFY
  • Editor's Impressions Of The AUTIDEFY
  • Thermometer Accuracy [star rating='4.5']
  • Quality [star rating='3.6']
  • Value For Money [star rating='4.3']
  • Affordability [star rating='4.7']

AUTIDEFY Final Thoughts

"Drop in the probe."

The digital display is nice and small as well. The only reason I didn't give this 5 stars is because my betta fish didn't like it. So much easier than the ones that hang on the inside. Still a recommendation for me due to price and accuracy. It will make you wonder why nobody thought of it before. And I just really started to doubt it. And I just really started to doubt it.

Overall Score
3.8

[star rating="3.8"]
(25 Points)

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