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 [star rating='3.7']
  • Quality [star rating='4.1']
  • Value For Money [star rating='4.9']
  • Affordability [star rating='5']

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

[star rating="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 [star rating='2.6']
  • Quality [star rating='4']
  • Value For Money [star rating='3.8']
  • Affordability [star rating='4.5']

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

[star rating="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 [star rating='3.8']
  • Quality [star rating='4.4']
  • Value For Money [star rating='4.3']
  • Affordability [star rating='4.6']

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

[star rating="4.6"]
(3 Points)

4. Imagitarium Aquarium Strip Thermometer, Small

User Ratings: 39

Imagitarium THM-008 First Impressions

"Super easy."

The extra batteries where very much appreciated and came in handy. It is easy to use and install it'disappears' in your tank it is so unobtrusive. Set all six probes up in a terrarium with a constant temp of 88. The non-working ones still provide 2 batteries each AND. I use a small flashlight if I don't want to brighten the area. Was going to get a floater until I saw this magnetic one! I tested this in a cup crammed full of ice and some water.

  • Imagitarium Aquarium Strip Thermometer, Small
  • Aquarium Strip Thermometer from Imagitarium
  • Adheres to the outside of glass or acrylic fish tanks for an easy and secure instillation
  • Measures in Celsius and Fahrenheit
  • Uses easy-to-read measurements
  • Ideal for freshwater or saltwater fish tanks
  • Manufacture: Imagitarium
  • Item Weight: 0.32 ounces
  • Editor's Impressions Of The Imagitarium THM-008
  • Thermometer Accuracy [star rating='4.2']
  • Quality [star rating='4.4']
  • Value For Money [star rating='3']
  • Affordability [star rating='4.1']

Imagitarium THM-008 Final Thoughts

"I opened the first three."

The display can be set to Fahrenheit or Celsius. I have to admit I had two reasons for buying six. And I just really started to doubt it. The only reason I didn't give this 5 stars is because my betta fish didn't like it. If the digital display starts to get dim, it's time for a new battery. Since it is a mercury thermometer, it is very accurate. Checked with temp gun and the terrarium was on target at 88.

Overall Score
4.0

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

5. AUTIDEFY LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature

User Ratings: 63 7

AUTIDEFY First Impressions

"8 C lower than this."

This thermometer is spot on accurate. It is large enough to see without being obtrusive. Bought the two pack of thermometers. The suction works for a month at a time- in pool and hot tub circulation. Very impressed, I have now had them in used for a month so far. 82 PER THERMOMETER with battery included. And for the price you cant beat it.

  • AUTIDEFY LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature
  • Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water)
  • Digital °C /° F thermometer;Temperature range -50°c ~ + 70°c,Operating temperature -10°c ~ +50°c
  • Easy to apply suction cup and easy to read LCD screen; Temperature readings to within 0.1 degree
  • Powered by one LR44 button cell (included)
  • Package Contents: 3 x Battery; 3 x Digital Thermometer;3 x Probe
  • Manufacture: AUTIDEFY
  • Editor's Impressions Of The AUTIDEFY
  • Thermometer Accuracy [star rating='4.9']
  • Quality [star rating='4.2']
  • Value For Money [star rating='3.5']
  • Affordability [star rating='3.3']

AUTIDEFY Final Thoughts

"I must say."

Water tested with Autidefy brand for two hours. For something so cheap, they are working remarkably well. This is my first 5 star review out of many many reviews on Amazon. I was using one of those ubiquitous cheap digital thermometers on Amazon. SIX Digital Thermometers with SIX batteries INCLUDED working so well. I had my heater set at 73-degrees and the thermometers showed 74. Personally I do not mind the way it looks in my aquarium.

Overall Score
4.2

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

6. Jardin Suction Cup Mounting Submersible Aquarium Index Thermometer, -10 to 50 Degree C

User Ratings: 46

JARDIN a12081700ux0929 First Impressions

"It sticks very firmly."

The non-working ones still provide 2 batteries each AND. However, Lucy at Zacro read this review and emailed me. Then she followed up again on that, asking if they had arrived and were okay. So much so that I purchased a second set of 6. Personally I do not mind the way it looks in my aquarium. He was moving slow in the winter and we realized he needed a heater! In this scenario it would probably get knocked loose a lot.

  • Jardin Suction Cup Mounting Submersible Aquarium Index Thermometer, -10 to 50 Degree C
  • Product Name: Aquarium Index Thermometer; Temperature Reading Range
  • Product Name: Aquarium Index Thermometer; Temperature Reading Range: Aquarium: -50 Celsius Degree to +70Celsius Degree
  • Main Material: Plastic; Total Length: 107cm/42.1"; Display Size: 5.8 x 3.7 x 1.2cm/2.3" x 1.5" x 0.48"(L x W x T)
  • Probe Length: 2.1 × 0.5cm/0.83" × 0.2"(L x D); Cable Length(Approx.): 101cm/39.8"
  • Net Weight: 24g; Package Contents: 1 × Aquarium Index Thermometer,2 × Suction Cups
  • Manufacture: Dragonmarts Co. Ltd. / Uxcell
  • Product Dimensions: 42.13 x 0.47 x 1.46 inches; 0.35 Ounces
  • Editor's Impressions Of The JARDIN a12081700ux0929
  • Thermometer Accuracy [star rating='4.3']
  • Quality [star rating='4.3']
  • Value For Money [star rating='4.7']
  • Affordability [star rating='3.7']

JARDIN a12081700ux0929 Final Thoughts

"Disappointed."

A battery can last you up to six months, I'd say, but expect more like three. Only thing I don't love is how long the cord is. Excellent working for our bearded dragon tank. He acted aggressively towards it and so I ultimate ended up removing it due to that. Who knows, whatever it was, it was revolting! The display can be set to Fahrenheit or Celsius. These are the perfect size to be easily read while not being obtrusive.

Overall Score
4.2

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

7. Marina Floating Thermometer with Suction Cup

User Ratings: 70 5

Marina 11201A1 First Impressions

"So I guess I needed them!"

This thermometer is spot on accurate. So much so that I purchased a second set of 6. Still a recommendation for me due to price and accuracy. Personally I do not mind the way it looks in my aquarium. The digital display is nice and small as well. A bit large for anything smaller than 5 gallons, but that's to be expected. This is my first 5 star review out of many many reviews on Amazon.

  • Marina Floating Thermometer with Suction Cup
  • 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
  • Manufacture: Marina
  • Product Dimensions: 7 x 4 x 1 inches; 0.35 Ounces
  • Editor's Impressions Of The Marina 11201A1
  • Thermometer Accuracy [star rating='3.9']
  • Quality [star rating='3.5']
  • Value For Money [star rating='3.7']
  • Affordability [star rating='4.8']

Marina 11201A1 Final Thoughts

"I like this."

A bit large for anything smaller than 5 gallons, but that's to be expected. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. The digital display itself is easy to read at a glance. They are within a degree or two of other thermometers I've checked to compare them. I am extremely pleased with this product. He acted aggressively towards it and so I ultimate ended up removing it due to that. This temperature read a perfect 32 degrees.

Overall Score
4.4

[star rating="4.4"]
(8702 Points)

8. Zoo Med Digital Thermometer

User Ratings: 71 5

Zoo Med TH-24 First Impressions

"Sticks easy."

When I set up my newest tank I will be getting another one of these. This is my first 5 star review out of many many reviews on Amazon. I used these to raise chicks, and in my parrot cages. I am extremely pleased with this product. I used to have a large hang in the side tank that you couldn't miss. Now if it falls into a sink full of water, it's not a problem. This is my first 5 star review out of many many reviews on Amazon.

  • Zoo Med Digital Thermometer
  • External sensor can go in water
  • Fahrenheit and Celsius
  • LCD readout
  • Pack of 3
  • Manufacture: Zoo Med
  • Product Dimensions: 4 x 1 x 5.3 inches; 0.63 Ounces
  • Editor's Impressions Of The Zoo Med TH-24
  • Thermometer Accuracy [star rating='4.5']
  • Quality [star rating='4.5']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='4.9']

Zoo Med TH-24 Final Thoughts

"They are within 0."

SIX Digital Thermometers with SIX batteries INCLUDED working so well. I have always had trouble reading the color temp. You can use the thermometer with or without the plastic suction cup. Now that the chickens are grown, I have one out in the coop as well. SIX Digital Thermometers with SIX batteries INCLUDED working so well. This thermometer is spot on accurate. I got the second one as a bonus that I'm now using in my old tank.

Overall Score
4.3

[star rating="4.3"]
(22 Points)

9. Maxmoral 4pcs Thermometer Strips Stick-on Digital Thermometer Strip Temperature Stickers Degree Cels...

User Ratings: 61

Maxmoral First Impressions

"I like these."

The digital display is nice and small as well. Place it on your aquarium and you are good to go. I got the second one as a bonus that I'm now using in my old tank. You can glue, tape or simply cover the cords in the tank to keep them discreet. In the right situation this magnet thermometer is the best available. I guess these units do not like saltwater. I had my heater set at 73-degrees and the thermometers showed 74.

  • Maxmoral 4pcs Thermometer Strips Stick-on Digital Thermometer Strip Temperature Stickers Degree Celsius Fahrenheit Display for Aquarium
  • Type:4pcs Thermometer Strips.Size:13x1.8cm/5.12x0.71 in.
  • Thermometer strips provide 2 different temperature readings,one is Celsius, ranging from 18 to 34 degrees Celsius, and the other is the corresponding Fahrenheit temperature reading, ranging from 64 to 93 degrees Fahrenheit.
  • Three color markers can indicate the temperature condition, can change with the water temperature, each color represents the different water temperature condition, can see them clearly and quickly from the surface.
  • Adhesive on the back, just peel off the tape and stick to any surface. A strong adhesive will hold the thermometer in place.
  • Can be used in aquarium, fish tank,wine, beer, Kombucha,Brewing ,Fermentation and so on. The thermometer will not be displayed beyond the measured temperature.
  • Manufacture: Maxmoral
  • Editor's Impressions Of The Maxmoral
  • Thermometer Accuracy [star rating='4.9']
  • Quality [star rating='4.8']
  • Value For Money [star rating='4.9']
  • Affordability [star rating='4.6']

Maxmoral Final Thoughts

"Not just for aquariums!"

Bought the two pack of thermometers. I've checked it against two other thermometers that are accurate. I find that the temps are accurate, and this product gives added peace of mind. He acted aggressively towards it and so I ultimate ended up removing it due to that. Then she followed up again on that, asking if they had arrived and were okay. One of my aquariums is glass, and the other two are plastic. You dont HAVE to stick the display onto your tank.

Overall Score
4.6

[star rating="4.6"]
(3 Points)

10. Deep Blue Professional ADB12304 High Performance Digital LCD Stick-On for Aquarium

User Ratings: 47 21

Deep Blue Professional 894086 First Impressions

"Very accurate."

The extra batteries where very much appreciated and came in handy. I needed a solution that was not breakable and these do the trick! It is my opinion that everyone should have these that are in the Aquarium Hobby. 6F all six took about three minutes to read between 88. Personally I do not mind the way it looks in my aquarium. I came here to give this product a positive review. It is my opinion that everyone should have these that are in the Aquarium Hobby.

  • Deep Blue Professional ADB12304 High Performance Digital LCD Stick-On for Aquarium
  • Deep blue Hip Digital Led (Stick-On) from Deep Blue Professional, Thermometer & Hydrometer category with model ADB12304
  • Deep blue Hip Digital Led (Stick-On) used for Pets
  • Made in USA
  • Package Dimension: 12.7cm x 2.54cm x 0.25cm
  • Manufacture: TopDawg Pet Supply
  • Product Dimensions: 1 x 1 x 1 inches; 0.35 Ounces
  • Editor's Impressions Of The Deep Blue Professional 894086
  • Thermometer Accuracy [star rating='4.3']
  • Quality [star rating='3.9']
  • Value For Money [star rating='2.8']
  • Affordability [star rating='2.8']

Deep Blue Professional 894086 Final Thoughts

"Just received it today."

Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. These digital thermometers are great and there is no guesswork involved. I ordered a new one and it works GREAT! I had my heater set at 73-degrees and the thermometers showed 74. I had my heater set at 73-degrees and the thermometers showed 74. The suction works for a month at a time- in pool and hot tub circulation. You can not swivle the thermometer to face a certain way.

Overall Score
3.5

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

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