Editor's Choice - Our Favorite Penn-Plax Aquarium Thermometers

1. Penn-Plax Standing Thermometer

User Ratings: 49

Penn-Plax TS First Impressions

"Which is good."

So the extra units will always come in handy. The suction works for a month at a time- in pool and hot tub circulation. Now if it falls into a sink full of water, it's not a problem. It is large enough to see without being obtrusive. Place it on your aquarium and you are good to go. And I just really started to doubt it. I had my heater set at 73-degrees and the thermometers showed 74.

  • Penn-Plax Standing Thermometer
  • Standing Style Glass Aquarium Thermometer
  • Accurate Easy To Read
  • This Product Is Made In China
  • Package Dimensions: 0.6" L X 3.1" W X 7.4" H
  • Manufacture: Penn Plax, INC.
  • Product Dimensions: 0.6 x 3.1 x 7.4 inches; 0.8 Ounces
  • Editor's Impressions Of The Penn-Plax TS
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Penn-Plax TS Final Thoughts

"Close enough I reckon!"

I recommend gluing the suction cups in place where needed for long-term installation. A bit large for anything smaller than 5 gallons, but that's to be expected. I use a small flashlight if I don't want to brighten the area. My poor fish was in 86 degrees water for a month. The only reason I didn't give this 5 stars is because my betta fish didn't like it. So this is the extreme end of the high temperature range. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK.

Overall Score
4.3


(13 Points)

Peoples Choice - Other Highly Rated Penn-Plax Aquarium Thermometers

2. Penn-Plax Stainless Steel Thermometer

User Ratings: 52 25

Penn-Plax 54537105 First Impressions

"Only thing the battries."

I don't think they are backlit but for the price they are still nice. I have mine on my 60 gallon cube marine tank. Since it is a mercury thermometer, it is very accurate. One of my aquariums is glass, and the other two are plastic. Personally I do not mind the way it looks in my aquarium. This temperature read a perfect 32 degrees. I find that the temps are accurate, and this product gives added peace of mind.

  • Penn-Plax Stainless Steel Thermometer
  • Penn-Plax is committed to creating and manufacturing innovative pet products
  • Penn Plax is a name that stands for Quality Innovation and Integrity
  • Experience a great line of Pet Products
  • Manufacture: Pro-Motion Distributing - Direct
  • Product Dimensions: 5 x 2 x 4 inches; 0.71 Ounces
  • Editor's Impressions Of The Penn-Plax 54537105
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Penn-Plax 54537105 Final Thoughts

"Fast accurate readings."

Simple fix, you adjust the thermometer within the suction cup and VIOLA! You can use the thermometer with or without the plastic suction cup. One extra battery came with each unit. It is my opinion that everyone should have these that are in the Aquarium Hobby. So the extra units will always come in handy. A battery can last you up to six months, I'd say, but expect more like three. Excellent working for our bearded dragon tank.

Overall Score
3.6


(3 Points)

3. Penn Plax PP37201 Digital Aquarium Thermometer

User Ratings: 60

Penn-Plax First Impressions

"So far loving it."

So the extra units will always come in handy. The digital display itself is easy to read at a glance. In the right situation this magnet thermometer is the best available. Works well in my betta tank, but provide a couple hours for it to read temp changes. He acted aggressively towards it and so I ultimate ended up removing it due to that. The lid is textured aluminum, and the suction cups don't stick to that. I bought these for my dwc reservoirs.

  • Penn Plax PP37201 Digital Aquarium Thermometer
  • Clear numbers for easy readings
  • Displays Fahrenheit and Celsius temperatures
  • Pressure-sensitive backing mounts outside of tank
  • Manufacture: Penn Plax
  • Editor's Impressions Of The Penn-Plax
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Penn-Plax Final Thoughts

"Great for price."

This doesn't bother me as it ws so cheap. You can glue, tape or simply cover the cords in the tank to keep them discreet. I have to admit I had two reasons for buying six. I have kept aquariums for about 45 years. I just wrote it off as a minor loss. I read some of the 1 star reviews and most of them are not about the product. Since it is a mercury thermometer, it is very accurate.

Overall Score
4.6


(3 Points)

4. (2 Pack) Zoo Med Economy Analog Dual Thermometer and Humidity Gauge

User Ratings: 72 3

Zoo Med TH-27 First Impressions

"Appears to be accurate."

Then she followed up again on that, asking if they had arrived and were okay. Only thing I don't love is how long the cord is. 6 inch long Bala Sharks that are known to be very unruly and boisterous. Simple fix, you adjust the thermometer within the suction cup and VIOLA! We are using them to measure various temperatures inside and outside of a motorhome. I think the people who said the suction cup broke. So, in those cases, I find it easier to simply replace it.

  • (2 Pack) Zoo Med Economy Analog Dual Thermometer and Humidity Gauge
  • Allows precise monitoring of both the temperature and humidity of your terrarium from one unit
  • Temperature and humidity levels are extremely important to the long term heath of your animals
  • Velcro backing enables easy removal for cleaning or relocation
  • New Dual Analog Terrarium Thermometer/Hygrometer
  • Pack of 2
  • Manufacture: Zoo Med
  • Product Dimensions: 6 x 2 x 4 inches; 1.6 Ounces
  • Editor's Impressions Of The Zoo Med TH-27
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Zoo Med TH-27 Final Thoughts

"Great product!"

I use a small flashlight if I don't want to brighten the area. As you can see from my photos, in both°F and°C, all six are within. Since it is a mercury thermometer, it is very accurate. They reviewed the packaging or shipping by saying it arrived broken. One extra battery came with each unit. 89 I could buy Six Thermometers with Six included batteries. You dont HAVE to stick the display onto your tank.

Overall Score
4.5


(321 Points)

5. Wansan LCD Digital Aquarium Thermometer for Fish Tank Water Terrarium Temperature (Pack of 1,Black)

Wansan First Impressions

"1 degree of each other."

It is about 6 inches in length and roughly an inch wide. We are using them to measure various temperatures inside and outside of a motorhome. So this is the extreme end of the high temperature range. The suction will never be the same. I tested this in a cup crammed full of ice and some water. These digital thermometers are great and there is no guesswork involved. We are using them to measure various temperatures inside and outside of a motorhome.

  • Wansan LCD Digital Aquarium Thermometer for Fish Tank Water Terrarium Temperature (Pack of 1,Black)
  • Our Thermometer is made of durable plastic and clear, big LCD screen, lightweight and easy to read.
  • Package including:1 x Aquarium Thermometer
  • Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water).
  • Easy to install.
  • Compact design for discrete use
  • Manufacture: Wansan
  • Product Dimensions: 0.39 x 0.39 x 0.39 inches; 1.06 Ounces
  • Editor's Impressions Of The Wansan
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Wansan Final Thoughts

"Buy these."

The plastic from the suction cup quickly turned from a clear to a milky white. We are using them to measure various temperatures inside and outside of a motorhome. I think the people who said the suction cup broke. This company is taking the long term view of how to do business right. This thermometer is spot on accurate. I used to have a large hang in the side tank that you couldn't miss. We are using them to measure various temperatures inside and outside of a motorhome.

Overall Score
5.0


(1 Points)

6. Taam Stick On Thermometer Reads Between 64-93 Degrees F

User Ratings: 57 43

TAAM First Impressions

"Working wonderfully!"

Place it on your aquarium and you are good to go. Now that the chickens are grown, I have one out in the coop as well. I used these on a number of my aquariums that have discus fish in them. Instead she sent a new package of two, both of which work. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. You dont HAVE to stick the display onto your tank. A battery can last you up to six months, I'd say, but expect more like three.

  • Taam Stick On Thermometer Reads Between 64-93 Degrees F
  • Display Temperature in Centigrade & Fahrenheit ★ 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.
  • Simple Stick On ★ Simply pull the back sticker off and apply the adhesive side to the front of your fish tank/aquarium/carboy/jar/fermentation bucket or any surface. Great way to keep an eye on your fish tank/wine jar/kombucha temp.
  • Easy To Read ★ The thermometer strip is temperature sensitive & splash proof. Colored marking shows the current reading temperature. If it shows multi-color in the strip, it's reading the temperature in between the numbers.
  • The best kombucha brew temp is 78℉ to 85℉. Keep your betta’s water temperature between 78℉ to 80℉ for best result.
  • 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!
  • Manufacture: TAAM
  • Product Dimensions: 0.02 x 0.02 x 0.02 inches; 0.16 Ounces
  • Editor's Impressions Of The TAAM
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

TAAM Final Thoughts

"It is within."

You can glue, tape or simply cover the cords in the tank to keep them discreet. I used to have a large hang in the side tank that you couldn't miss. I used to have a large hang in the side tank that you couldn't miss. Ambient room temperature measures 72. When I set up my newest tank I will be getting another one of these. Water tested with Autidefy brand for two hours. It started working as soon as I put it in and has been working ever since.

Overall Score
3.3


(5 Points)

7. Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature

User Ratings: 74 3

Zacro FBA_ZDT1-AUX-1 First Impressions

"I like this."

I have kept aquariums for about 45 years. For something so cheap, they are working remarkably well. So the extra units will always come in handy. One of my aquariums is glass, and the other two are plastic. It works equally well on all of them. Personally I do not mind the way it looks in my aquarium. My only complaint is that they tend to be a one time use.

  • Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature
  • 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.
  • Manufacture: Zacro
  • Editor's Impressions Of The Zacro FBA_ZDT1-AUX-1
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Zacro FBA_ZDT1-AUX-1 Final Thoughts

"7 reading."

The lid is textured aluminum, and the suction cups don't stick to that. This company is taking the long term view of how to do business right. 2 deg, if it was 32, it would be a SOLID block of ice. I recommend gluing the suction cups in place where needed for long-term installation. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. For the price I'll probably end up putting these in all of my aquariums. All were Close enough for a fish tank and other uses.

Overall Score
4.5


(4472 Points)

8. AquaTop ATP Thermometer Submersible

User Ratings: 28 16

AquaTop DTG-15 First Impressions

"Very accurate."

So, in those cases, I find it easier to simply replace it. I have always had trouble reading the color temp. So far, they're all doing their job in my four tanks and I am quite content. For something so cheap, they are working remarkably well. Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. I used to have a large hang in the side tank that you couldn't miss. My only complaint is that they tend to be a one time use.

  • AquaTop ATP Thermometer Submersible
  • The sleek, compact designs provide easy placement, making the DTG-15 and dtg-25 the perfect choice for aquariums of all sizes.
  • The digital thermometers are accurate to +/- 2 degrees Fahrenheit.
  • The DTG-15 is fully submersible and has a suction cup mount.
  • The dtg-25 has an adhesive back for easy installation and must be mounted externally.
  • Suction Cup mount
  • Manufacture: Aquatop
  • Product Dimensions: 8 x 3 x 2 inches; 1.41 Ounces
  • Editor's Impressions Of The AquaTop DTG-15
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

AquaTop DTG-15 Final Thoughts

"I opened the first three."

I was using one of those ubiquitous cheap digital thermometers on Amazon. These digital thermometers are great and there is no guesswork involved. 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 can't say which is the most accurate and don't really care. So much easier than the ones that hang on the inside. This temperature read a perfect 32 degrees.

Overall Score
3.1


(6 Points)

9. KollerCraft TOM Temp Alert Digital Thermometer for Aquariums

User Ratings: 39 13

KollerCraft TM1208 First Impressions

"A solid five stars."

The only reason I didn't give this 5 stars is because my betta fish didn't like it. I'm pretty sure those reviewers have acrylic tanks. And for the price you cant beat it. I did have a problem with one in my first pack of 6. Was going to get a floater until I saw this magnetic one! Checked with temp gun and the terrarium was on target at 88. The non-working ones still provide 2 batteries each AND.

  • KollerCraft TOM Temp Alert Digital Thermometer for Aquariums
  • Digital thermometer for aquariums reliably monitors high and low temperatures
  • Audible and LED notifications when temperatures fall below or rise above presets
  • Presets for a low of 75 degrees F and a high of 82 degrees F
  • For use in both freshwater and saltwater aquariums
  • Plastic probe with suction cup, 3-foot cord
  • Warning when the temperature goes outside the preset range
  • Display is easy to read
  • Temperature reading is very accurate
  • Manufacture: Koller Enterprises
  • Product Dimensions: 7.5 x 5 x 1.5 inches; 1.6 Ounces
  • Editor's Impressions Of The KollerCraft TM1208
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

KollerCraft TM1208 Final Thoughts

"Never had any problems."

Very impressed, I have now had them in used for a month so far. This is my first 5 star review out of many many reviews on Amazon. Works well in my betta tank, but provide a couple hours for it to read temp changes. I have this thermometer on all my tanks. 82 PER THERMOMETER with battery included. I tested this in a cup crammed full of ice and some water. I had my heater set at 73-degrees and the thermometers showed 74.

Overall Score
3.7


(52 Points)

10. American Thermal Liquid Crystal Aquarium Thermometer Vertical Small

User Ratings: 72 7

Amer Thermal Instruments BC002021 First Impressions

"Perhaps it's my fault."

I have to admit I had two reasons for buying six. It is always where yo last put it and it is very easy to see and read. The units each had a battery in place and situated for immediate use. These things are useful for a lot besides pet husbandry, too. This thermometer is spot on accurate. The units each had a battery in place and situated for immediate use. 6 in a pack, extra batteries, easy set up, great price.

  • American Thermal Liquid Crystal Aquarium Thermometer Vertical Small
  • Know your aquarium's temperature at a glance
  • Easy-to-read and accurate thermometer mounts on outside of your aquarium
  • Unbreakable, non-corrosive, and non-toxic
  • Fahrenheit scale
  • Manufacture: Amer Thermal Instruments
  • Editor's Impressions Of The Amer Thermal Instruments BC002021
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Amer Thermal Instruments BC002021 Final Thoughts

"Which is good."

You can glue, tape or simply cover the cords in the tank to keep them discreet. The suction cups work well anywhere I have placed it it has not Fallen. Simple fix, you adjust the thermometer within the suction cup and VIOLA! The digital display itself is easy to read at a glance. I can't say which is the most accurate and don't really care. In the right situation this magnet thermometer is the best available. So versatile, I can read the temperatures literally anywhere.

Overall Score
4.4


(384 Points)

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