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. LCD Digital Fish Tank Temperature Control Sensor Thermometer Wired Aquarium Fish Tank

Unknown First Impressions

"2 deg of 32."

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 used these to raise chicks, and in my parrot cages. I have mine on my 60 gallon cube marine tank. I have kept aquariums for about 45 years. So versatile, I can read the temperatures literally anywhere. Still a recommendation for me due to price and accuracy.

  • LCD Digital Fish Tank Temperature Control Sensor Thermometer Wired Aquarium Fish Tank
  • Manufacture: Unknown
  • Editor's Impressions Of The Unknown
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Unknown Final Thoughts

"A solid five stars."

I have this thermometer on all my tanks. So versatile, I can read the temperatures literally anywhere. Simple fix, you adjust the thermometer within the suction cup and VIOLA! At least in the first 3 months of use. For something so cheap, they are working remarkably well. In this scenario it would probably get knocked loose a lot. Still a recommendation for me due to price and accuracy.

Overall Score
4.0


(1 Points)

5. XYZReptiles Digital Reptile Thermometer

User Ratings: 49

XYZREPTILES.COM QUALITY · SERVICE · SELECTION First Impressions

"Hope this helps!"

I had my heater set at 73-degrees and the thermometers showed 74. He acted aggressively towards it and so I ultimate ended up removing it due to that. Sure enough the digital thermometer was way off by 6 degrees! I used these on a number of my aquariums that have discus fish in them. I used these to raise chicks, and in my parrot cages. One of my aquariums is glass, and the other two are plastic. I have it in both my aquariums now.

  • XYZReptiles Digital Reptile Thermometer
  • Our digital tank thermometers are made from high quality electronics to ensure an accurate temperature reading
  • Each digital thermometer easily switches between Celsius and Fahrenheit with a pin push to suite your preference
  • Features a powerful suction cup to ensure a solid connection to your reptile terrarium so that it stays put; just wet before sticking it to the terrariums surface
  • These futuristic and functional terrarium thermometers display a large digital temperature readout and are a vital part of every reptile habitat
  • Measures 2.5 inches by 1 inch at its widest part
  • Manufacture: XYZReptiles
  • Editor's Impressions Of The XYZREPTILES.COM QUALITY · SERVICE · SELECTION
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

XYZREPTILES.COM QUALITY · SERVICE · SELECTION Final Thoughts

"Subtracted from the tank."

Very impressed, I have now had them in used for a month so far. I don't think i'll ever be able to trust a digital thermometer again. This is my first 5 star review out of many many reviews on Amazon. I find that the temps are accurate, and this product gives added peace of mind. He was moving slow in the winter and we realized he needed a heater! Bought the two pack of thermometers. It is large enough to see without being obtrusive.

Overall Score
4.2


(6 Points)

6. Fluval Submersible Digital Thermometer

User Ratings: 63 12

Fluval 11194 First Impressions

"Perhaps it's my fault."

Very impressed, I have now had them in used for a month so far. My only complaint is that they tend to be a one time use. This thermometer is spot on accurate. So much easier than the ones that hang on the inside. Sure enough the digital thermometer was way off by 6 degrees! I have this thermometer on all my tanks. 6 inch long Bala Sharks that are known to be very unruly and boisterous.

  • Fluval Submersible Digital Thermometer
  • Features a large LED display
  • Fully submersible thermometer
  • Large screen for easy reading
  • Country Of Origin: China
  • Manufacture: Rolf C. Hagen (USA) Corp.
  • Product Dimensions: 1 x 2.6 x 4.9 inches; 0.81 Ounces
  • Editor's Impressions Of The Fluval 11194
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Fluval 11194 Final Thoughts

"It sticks very firmly."

I needed a solution that was not breakable and these do the trick! I have this thermometer on all my tanks. The suction works for a month at a time- in pool and hot tub circulation. Since it is a mercury thermometer, it is very accurate. My 50+ eyes cannot read a regular tank thermometer without squinting. Ordered three of these and they do the job. I just wrote it off as a minor loss.

Overall Score
3.9


(53 Points)

7. JLENOVEG Digital Aquarium Thermometer Room Thermometer Mini LCD Digital Aquarium Thermometer for Fis...

User Ratings: 53

JLENOVEG First Impressions

"Great product!"

6 inch long Bala Sharks that are known to be very unruly and boisterous. And is easily hidden behind a plant. For something so cheap, they are working remarkably well. Instead she sent a new package of two, both of which work. This temperature read a perfect 32 degrees. The non-working ones still provide 2 batteries each AND. It is easy to use and install it'disappears' in your tank it is so unobtrusive.

  • JLENOVEG Digital Aquarium Thermometer Room Thermometer Mini LCD Digital Aquarium Thermometer for Fish Tank Aquarium Vivarium Amphibian Reptile Terrariums Temperature (Non Waterproof, NO Farenheight)
  • Easy to stall: No sensor probe, just need to put the battery into the compartment. Sticking it to the water tank, the sensor sensed the temperature through the glass, or put it on your desk as a room thermometer.
  • Wide Range & Accurate: Thermometer Working Range: 0~40℃ ; High accuracy (±1°C) to ensure the fish is healthy in a safe temperature or detect the function of the aquarium tools
  • Easy to Read Aquarium thermometer: more large digital display, more clear with the bigger LCD. One LCD display one temperature, bright and clear the temperature to you.
  • Multifunction digital thermometer: Ideal for aquariums & reptile habitats. For use with both freshwater & marine aquariums, and great for monitoring temperatures in reptile & amphibian terrariums, and small animal habitats.
  • Multi-purpose thermometer, can be used as a aquarium thermometer, indoor thermometer and so on. Note: The thermometer can't be in the water.
  • Manufacture: Poly
  • Batteries: 1 LR44 batteries required. (included)
  • Editor's Impressions Of The JLENOVEG
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

JLENOVEG Final Thoughts

"Really easy to hook up."

The units each had a battery in place and situated for immediate use. Was going to get a floater until I saw this magnetic one! I find that the temps are accurate, and this product gives added peace of mind. This little wonder allows me to see at a glance that everything is as it should be. When I set up my newest tank I will be getting another one of these. My 50+ eyes cannot read a regular tank thermometer without squinting. 89 I could buy Six Thermometers with Six included batteries.

Overall Score
4.2


(12 Points)

8. JARDIN Aquarium Digital Thermometer with Probe

User Ratings: 50 50

JARDIN a12101200ux0125 First Impressions

"Would buy again."

I got root rot after light leaks and high water temps. This company is taking the long term view of how to do business right. Who knows, whatever it was, it was revolting! The display can be set to Fahrenheit or Celsius. The temperature fluctuated a lot with it. They reviewed the packaging or shipping by saying it arrived broken. Far more accurate than the usual small glass ones or external LCD strips.

  • JARDIN Aquarium Digital Thermometer with Probe
  • Product Name : Aquarium Thermometer; Color : Black
  • Material : Plastic; Power : 1 x AAA Battery ( Not Included)
  • Size : 11. 5 x 3 x 3cm/4.5" x 1.2" x 1.2"(L*W*H);Cable Length : 1M/39.4"
  • Weight : 40g
  • Package Contents : 1 × Aquarium Thermometer
  • Manufacture: Jardin
  • Product Dimensions: 4.72 x 1.57 x 1.57 inches; 1.44 Ounces
  • Editor's Impressions Of The JARDIN a12101200ux0125
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

JARDIN a12101200ux0125 Final Thoughts

"I am new to the hobby."

Ambient room temperature measures 72. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. I bent it a little bit and when I put it back it was perfectly fine. He was moving slow in the winter and we realized he needed a heater! I had my heater set at 73-degrees and the thermometers showed 74. Far more accurate than the usual small glass ones or external LCD strips. All were Close enough for a fish tank and other uses.

Overall Score
3.0


(3 Points)

9. Digital Display Thermometer - Aquarium, Terrarium, Fish Tank - Fahrenheit & Celsius

User Ratings: 34

Invert Aquatics First Impressions

"Very accurate."

These digital thermometers are great and there is no guesswork involved. This is my first 5 star review out of many many reviews on Amazon. I think the people who said the suction cup broke. I have this thermometer on all my tanks. You can not swivle the thermometer to face a certain way. Sure enough the digital thermometer was way off by 6 degrees! For something so cheap, they are working remarkably well.

  • Digital Display Thermometer - Aquarium, Terrarium, Fish Tank - Fahrenheit & Celsius
  • Easy to read Digital Display can be set to Fahrenheit or Celsius (Unit is 2 1/4" x 1 1/2")
  • Battery Included, 2 Suction Cups Included for easy Mounting, 37" Long Probe Line
  • Accurate and Fast Readings of your Aquarium or Terrarium
  • Submerge only the probe into water (Display remains dry on outside of tank)
  • Ranges from -58 Degrees Fahrenheit to 158 Degrees Fahrenheit
  • Manufacture: Invert Aquatics
  • Batteries: 1 Unknown batteries required. (included)
  • Editor's Impressions Of The Invert Aquatics
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Invert Aquatics Final Thoughts

"Doing the math."

We are using them to measure various temperatures inside and outside of a motorhome. In the right situation this magnet thermometer is the best available. Water tested with Autidefy brand for two hours. I can't say which is the most accurate and don't really care. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. 89 I could buy Six Thermometers with Six included batteries. I bent it a little bit and when I put it back it was perfectly fine.

Overall Score
4.0


(3 Points)

10. Genuine Pavia Rectal Temp Veterinary Thermometer for Dogs, Cats, Horses, Pets and Livestock. Accurat...

Pavia Rectal Temp Veterinary Thermometer First Impressions

"89 plus free shipping."

Now if it falls into a sink full of water, it's not a problem. One of my aquariums is glass, and the other two are plastic. These digital thermometers are great and there is no guesswork involved. The non-working ones still provide 2 batteries each AND. The units each had a battery in place and situated for immediate use. As you can see from my photos, in both°F and°C, all six are within. For the price I'll probably end up putting these in all of my aquariums.

  • Genuine Pavia Rectal Temp Veterinary Thermometer for Dogs, Cats, Horses, Pets and Livestock. Accurate Temps in Only 6 Seconds. Beeps When Ready. Trusted by Veterinarians, Breeders and Pet Owners.
  • PAVIA VETERINARY THERMOMETER: Fast, accurate rectal temps in as quick as 6 seconds. Used in veterinary clinics the world over, now available direct to kennels, rescues, shelters, breeders and pet owners everywhere.
  • FAST AND ACCURATE: Stable, accurate temperature readings in as quick as 6 seconds. Accurate to within +/- 0.2°F. Beeps when ready.
  • VERSATILE &ERGONOMIC: The small-diameter, 3-inch-long probe enables temperature taking of any size animal. Designed for easy holding and operation. Large, easy-view, 4-digit LCD.
  • RUGGED & DEPENDABLE: Tough, smooth exterior disinfects easily with soap or alcohol. Probe covers are not required. Ready to use at the press of a button.
  • IN THE BOX: Pavia Rectal TEMP Veterinary Thermometer, two (2) AAA batteries, Instructions. 90-day warranty.
  • Manufacture: Pavia Sales Group
  • Editor's Impressions Of The Pavia Rectal Temp Veterinary Thermometer
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Pavia Rectal Temp Veterinary Thermometer Final Thoughts

"It is within."

I bought these for my dwc reservoirs. The units each had a battery in place and situated for immediate use. However, Lucy at Zacro read this review and emailed me. 82 PER THERMOMETER with battery included. My poor fish was in 86 degrees water for a month. Water tested with Autidefy brand for two hours. In the right situation this magnet thermometer is the best available.

Overall Score
5.0


(3 Points)

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