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. Aquarium Fish Tank Thermometer with Easy Read Large Numbers and Ideal Range Guide for Fresh or Marin...

AquariumH2o First Impressions

"Never had any problems."

The suction works for a month at a time- in pool and hot tub circulation. I was using one of those ubiquitous cheap digital thermometers on Amazon. For the price I'll probably end up putting these in all of my aquariums. Set all six probes up in a terrarium with a constant temp of 88. Set all six probes up in a terrarium with a constant temp of 88. I removed the batteries of the units I wasn't using right away. I have kept aquariums for about 45 years.

  • Aquarium Fish Tank Thermometer with Easy Read Large Numbers and Ideal Range Guide for Fresh or Marine Fish Tank
  • Easy to read Glass Thermometer
  • Floats at top of aquarium, weighted end keeps upright
  • Includes rubber suction cup to attach to glass or plastic aquarium walls
  • Sealed glass, easy to clean Length 4 1/4" x 1/2" diameter Ideal for fresh water, marine, aquariums, terrariums, vivariums and fish tanks
  • Manufacture: United Aquatics, LLC.
  • Editor's Impressions Of The AquariumH2o
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

AquariumH2o Final Thoughts

"2 deg of 32."

6 in a pack, extra batteries, easy set up, great price. So much so that I purchased a second set of 6. Far more accurate than the usual small glass ones or external LCD strips. The suction cups work well anywhere I have placed it it has not Fallen. This little wonder allows me to see at a glance that everything is as it should be. Works well in my betta tank, but provide a couple hours for it to read temp changes. 82 PER THERMOMETER with battery included.

Overall Score
5.0


(1 Points)

5. AQUANEAT 6 Pack Aquarium Thermometer, Reptile Thermometer, Fish Tank Thermometer, Digital Thermomete...

User Ratings: 58 8

AQUANEAT DT-A045x6 First Impressions

"Very accurate."

In this scenario it would probably get knocked loose a lot. Then is started to give a low reading, and it is not reading the correct temperature. I have this thermometer on all my tanks. Now if it falls into a sink full of water, it's not a problem. So, in those cases, I find it easier to simply replace it. I had my heater set at 73-degrees and the thermometers showed 74. I have mine on my 60 gallon cube marine tank.

  • AQUANEAT 6 Pack Aquarium Thermometer, Reptile Thermometer, Fish Tank Thermometer, Digital Thermometer, Terrarium Water Temperature Test, with Large LCD Display
  • 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
  • Manufacture: AQUANEAT
  • Editor's Impressions Of The AQUANEAT DT-A045x6
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

AQUANEAT DT-A045x6 Final Thoughts

"No complaints."

Love it, it's easy to read and keeps an accurate temp. He acted aggressively towards it and so I ultimate ended up removing it due to that. Works well in my betta tank, but provide a couple hours for it to read temp changes. So far I've been very thrilled with these. I recommend gluing the suction cups in place where needed for long-term installation. I have to admit I had two reasons for buying six. Checked with temp gun and the terrarium was on target at 88.

Overall Score
4.1


(219 Points)

6. Water & Wood Aquarium Fishbowl Dual Scale Thermometer Sticker Strip 2 in 1

User Ratings: 48

Waterwood First Impressions

"Not just for aquariums!"

And for the price you cant beat it. The display can be set to Fahrenheit or Celsius. 2 deg, if it was 32, it would be a SOLID block of ice. It will make you wonder why nobody thought of it before. When I set up my newest tank I will be getting another one of these. I bought these for my dwc reservoirs. I don't think i'll ever be able to trust a digital thermometer again.

  • Water & Wood Aquarium Fishbowl Dual Scale Thermometer Sticker Strip 2 in 1
  • Aquarium Fishbowl Dual Scale Thermometer Sticker Strip 2 in 1
  • New product with high quality
  • Manufacture: Water & Wood
  • Editor's Impressions Of The Waterwood
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Waterwood Final Thoughts

"Which is good."

I got the second one as a bonus that I'm now using in my old tank. I'm pretty sure those reviewers have acrylic tanks. It works equally well on all of them. SIX Digital Thermometers with SIX batteries INCLUDED working so well. 49 thermometer that is 100% accurate. For the price I'll probably end up putting these in all of my aquariums. I can't say which is the most accurate and don't really care.

Overall Score
4.0


(2 Points)

7. Dimart Boyu Bt-08 Premium Aquarium Digital Thermometer Digital Thermostat Oven Thermometer Thermosta...

Dimart First Impressions

"Exactly what I needed."

Put them all in the same tank and they read very close to each other. Since it is a mercury thermometer, it is very accurate. The units each had a battery in place and situated for immediate use. I had my heater set at 73-degrees and the thermometers showed 74. I ordered a new one and it works GREAT! Since adding one of these, it has been much easier to monitor the temp of my tanks. Have checked them against the glass thermometers and the accuracy is right on.

  • Dimart Boyu Bt-08 Premium Aquarium Digital Thermometer Digital Thermostat Oven Thermometer Thermostat Thermometer with Probe Vehicle Fish Tank Aquarium Refrigerator Embedded (Black)
  • Wireless with integrated probe for easy use.
  • Ideal for Aquarium or terrarium temperature monitoring
  • Easy-to-read LCD displays temperature in Fahrenheit or Celsius
  • Enjoy convenient monitoring of parameters essential to Fish and reptile health
  • Best choice for your home fish tank & aquariums.
  • Manufacture: Dimart
  • Editor's Impressions Of The Dimart
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Dimart Final Thoughts

"Currently maintains a 76."

I just wrote it off as a minor loss. In this scenario it would probably get knocked loose a lot. I am extremely pleased with this product. 50 thermometers, reads much easier and no suction cup residue, also looks better. Then she followed up again on that, asking if they had arrived and were okay. So, in those cases, I find it easier to simply replace it. So far I've been very thrilled with these.

Overall Score
5.0


(2 Points)

8. Fish Tank Suction Cup Thermometer Water Temperature L 0-50 Celsius Aquarium Marine Glass

Fashion Life First Impressions

"There is no question."

It worked great and I highly recommend it! These digital thermometers are great and there is no guesswork involved. I ordered a new one and it works GREAT! This is how you calibrate a thermometer. Excellent working for our bearded dragon tank. A battery can last you up to six months, I'd say, but expect more like three. I can't say which is the most accurate and don't really care.

  • Fish Tank Suction Cup Thermometer Water Temperature L 0-50 Celsius Aquarium Marine Glass
  • Aquarium thermometer for fish tank usage.
  • Look no further, buy instantly
  • Manufacture: Fashion Life
  • Editor's Impressions Of The Fashion Life
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Fashion Life Final Thoughts

"They all were within."

Excellent working for our bearded dragon tank. However, Lucy at Zacro read this review and emailed me. So much easier than the ones that hang on the inside. I don't think i'll ever be able to trust a digital thermometer again. Was going to get a floater until I saw this magnetic one! Simple fix, you adjust the thermometer within the suction cup and VIOLA! This company is taking the long term view of how to do business right.

Overall Score
5.0


(2 Points)

9. Digital Mini Automatic LCD Aquarium Fish Tank Food Feeder Timer up to 4 Feeding Times + High Accurac...

User Ratings: 27 24

hossen B008R6NWOU First Impressions

"LOVE these thermometers."

I think the people who said the suction cup broke. I bent it a little bit and when I put it back it was perfectly fine. I bought these for my dwc reservoirs. So far I've been very thrilled with these. Now I'm getting back in on a much smaller scale with 3 gallon Acrylic Nano tanks. Works well in my betta tank, but provide a couple hours for it to read temp changes. I did have a problem with one in my first pack of 6.

  • Digital Mini Automatic LCD Aquarium Fish Tank Food Feeder Timer up to 4 Feeding Times + High Accuracy Submersible Aquarium Index Thermometer
  • Made in China
  • Package height :12.1 cm
  • Package length :8.0 cm
  • Package width :11.1 cm
  • Manufacture: hossen
  • Product Dimensions: 4.8 x 3.15 x 4.41 inches; 6.4 Ounces
  • Batteries: 2 AAA batteries required.
  • Editor's Impressions Of The hossen B008R6NWOU
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

hossen B008R6NWOU Final Thoughts

"This is perfect."

These things are useful for a lot besides pet husbandry, too. You can use the thermometer with or without the plastic suction cup. And I just really started to doubt it. Instead she sent a new package of two, both of which work. 2 deg, if it was 32, it would be a SOLID block of ice. The extra batteries where very much appreciated and came in handy. Very impressed, I have now had them in used for a month so far.

Overall Score
3.3


(165 Points)

10. 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
  • Quality
  • Value For Money
  • Affordability

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


(105 Points)

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