Editor's Choice - Our Favorite LCR Hallcrest Aquarium Thermometers

1. LCR Hallcrest A-1005 Liquid Crystal Vertical Aquarium Thermometer

User Ratings: 78 4

LCR Hallcrest A-1005 First Impressions

"It's accurate I tell you."

I removed the batteries of the units I wasn't using right away. I guess these units do not like saltwater. Now that the chickens are grown, I have one out in the coop as well. Checked with temp gun and the terrarium was on target at 88. I used these to raise chicks, and in my parrot cages. This is my first 5 star review out of many many reviews on Amazon. My poor fish was in 86 degrees water for a month.

  • LCR Hallcrest A-1005 Liquid Crystal Vertical Aquarium Thermometer
  • Easy To Read
  • Mounts Vertically On The Outside Of Your Aquarium
  • Easily Movable
  • Manufacture: Unique Cell Distributors LLC
  • Product Dimensions: 4 x 0.5 x 7 inches; 0.32 Ounces
  • Editor's Impressions Of The LCR Hallcrest A-1005
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

LCR Hallcrest A-1005 Final Thoughts

"Drop in the probe."

So much so that I purchased a second set of 6. A bit large for anything smaller than 5 gallons, but that's to be expected. You can glue, tape or simply cover the cords in the tank to keep them discreet. I used these to raise chicks, and in my parrot cages. So much easier than the ones that hang on the inside. 6F all six took about three minutes to read between 88. It is large enough to see without being obtrusive.

Overall Score
4.6


(794 Points)

Peoples Choice - Other Highly Rated LCR Hallcrest Aquarium Thermometers

2. LCR Hallcrest A-1007 Liquid Crystal Horizontal Aquarium Thermometer

LCR Hallcrest A-1007 First Impressions

"Would recommend!"

I think the people who said the suction cup broke. It is large enough to see without being obtrusive. I bought these for my dwc reservoirs. I have this thermometer on all my tanks. This little wonder allows me to see at a glance that everything is as it should be. As you can see from my photos, in both°F and°C, all six are within. SIX Digital Thermometers with SIX batteries INCLUDED working so well.

  • LCR Hallcrest A-1007 Liquid Crystal Horizontal Aquarium Thermometer
  • Easy To Read
  • Mounts Vertically On The Outside Of Your Aquarium
  • Easily Movable
  • Manufacture: Unique Cell Distributors LLC
  • Product Dimensions: 4 x 0.5 x 7 inches; 0.35 Ounces
  • Editor's Impressions Of The LCR Hallcrest A-1007
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

LCR Hallcrest A-1007 Final Thoughts

"And I am glad I did."

Have checked them against the glass thermometers and the accuracy is right on. Sure enough the digital thermometer was way off by 6 degrees! The temperature fluctuated a lot with it. I came here to give this product a positive review. I can't say which is the most accurate and don't really care. He acted aggressively towards it and so I ultimate ended up removing it due to that. The display can be set to Fahrenheit or Celsius.

Overall Score
5.0


(12 Points)

3. Vertical Aquarium Thermometer Mini

User Ratings: 77

LCR Hallcrest DPP30961 First Impressions

"Holds a steady 1."

6F all six took about three minutes to read between 88. My poor fish was in 86 degrees water for a month. I recommend gluing the suction cups in place where needed for long-term installation. 2 deg, if it was 32, it would be a SOLID block of ice. You can use the thermometer with or without the plastic suction cup. Water tested with Autidefy brand for two hours. Excellent working for our bearded dragon tank.

  • Vertical Aquarium Thermometer Mini
  • 5 mil thickness
  • 3 inch X 1 inch dimensions
  • Vertically mounted
  • Fahrenheit scale
  • Manufacture: LCR Hallcrest
  • Editor's Impressions Of The LCR Hallcrest DPP30961
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

LCR Hallcrest DPP30961 Final Thoughts

"Very accurate."

Place it on your aquarium and you are good to go. At least in the first 3 months of use. Still a recommendation for me due to price and accuracy. You dont HAVE to stick the display onto your tank. In this scenario it would probably get knocked loose a lot. I removed the batteries of the units I wasn't using right away. I tested this in a cup crammed full of ice and some water.

Overall Score
4.8


(5 Points)

4. 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
  • Quality
  • Value For Money
  • Affordability

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


(6 Points)

5. 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)

6. Ade Advanced Optics Dual Scale 1.0 to 1.070 S.G. Salinity Refractometer for Aquarium & Seawater

User Ratings: 75 5

Ade Advanced Optics SSA0010 First Impressions

"I like these."

The suction works for a month at a time- in pool and hot tub circulation. You can glue, tape or simply cover the cords in the tank to keep them discreet. I used these on a number of my aquariums that have discus fish in them. The units each had a battery in place and situated for immediate use. I have kept aquariums for about 45 years. I use a small flashlight if I don't want to brighten the area. The non-working ones still provide 2 batteries each AND.

  • Ade Advanced Optics Dual Scale 1.0 to 1.070 S.G. Salinity Refractometer for Aquarium & Seawater
  • One scale checks the NaCl levels with the range of 0-100 ppt (with 1 ppt scale divisions) and the other scale gauges Specific Gravity with a range of 1.000 to 1.070(+/-0.001 accuracy)
  • Features ATC (Automatic Temperature Compensation) for accurate readings.
  • Sturdy design, compact in size and light in weight, convenient to keep up and carry around.
  • It is suitable for a marine saltwater tank.
  • This Refractometer is backed by a 2 Year - No Hassle - Free Replacement Guarantee.
  • Manufacture: Ade Advanced Optics
  • Product Dimensions: 2 x 2 x 7 inches; 6.4 Ounces
  • Editor's Impressions Of The Ade Advanced Optics SSA0010
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

Ade Advanced Optics SSA0010 Final Thoughts

"Works perfect."

My 50+ eyes cannot read a regular tank thermometer without squinting. Since it is a mercury thermometer, it is very accurate. I ordered this guy and it was 6 degrees hotter than the digital! It is my opinion that everyone should have these that are in the Aquarium Hobby. The non-working ones still provide 2 batteries each AND. For the price I'll probably end up putting these in all of my aquariums. I tested this in a cup crammed full of ice and some water.

Overall Score
4.5


(854 Points)

7. SunGrow Digital pH and TDS Meter Set, Accurate Readings, Easy to Read LCD Screen, Monitor Aquarium, ...

User Ratings: 57 6

SunGrow First Impressions

"Great product!"

This thermometer is spot on accurate. 50 thermometers, reads much easier and no suction cup residue, also looks better. I just wrote it off as a minor loss. Checked with temp gun and the terrarium was on target at 88. I bent it a little bit and when I put it back it was perfectly fine. I think the people who said the suction cup broke. Set all six probes up in a terrarium with a constant temp of 88.

  • SunGrow Digital pH and TDS Meter Set, Accurate Readings, Easy to Read LCD Screen, Monitor Aquarium, Fruit, Tap Water, Pool Water, 4 LR44 Batteries Included
  • ✔ TWO-IN-ONE SOLUTION --- This Ph and TDS combo meter by SunGrow will give you the best of both worlds in one device. This SunGrow pack includes electrodes and components needed to test both the pH and TDS of any water solution. It’s easy to use and less equipment to deal with than two separate devices.
  • ✔ ENERGY-SAVING, LIGHTWEIGHT AND PORTABLE DEVICES--- This PH and TDS meter has a handheld pen-type design that weighs barely 1.7 oz making it lightweight and portable. It comes with a handy case that you can easily slip into a backpack or work bag if you need to bring it with you. The meter shuts off automatically after 10-minutes of non-use to conserve batteries. (BATTERIES INCLUDED)
  • ✔ CALIBRATION SCREWDRIVER INCLUDED --- These meters have been factory-calibrated and are designed to stay consistent. However, if you need to recalibrate your meter from time to time or you want to calibrate for different applications, you can use the screwdriver calibration tool included for continued accurate readings of your water. The TDS meter is most accurate when calibrated as close as possible to the sample to be tested.
  • ✔ HIGHLY ACCURATE READINGS --- This pH and TDS professional level water test meter precisely measures and monitors the levels in your aquarium or other liquid solutions. The SunGrow pH and TDS meter will give you extremely accurate readings of the ph levels and Total Dissolved Solid within ± 2% range.
  • ✔ MULTI-USE MEASURING TOOL--- This little tool is a valuable instrument for keeping a tab on various bodies of water. You can use it to make sure the level in your freshwater or saltwater aquarium is optimal for your fish, test water in a laboratory or for the hydroponically grown vegetables. You can also test the swimming pool, tap water, and spa water.
  • Manufacture: Luffy Pets Collection
  • Editor's Impressions Of The SunGrow
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

SunGrow Final Thoughts

"Easy to setup in tank."

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. Love it, it's easy to read and keeps an accurate temp. I used to have a large hang in the side tank that you couldn't miss. It will make you wonder why nobody thought of it before. Bought the two pack of thermometers. Place it on your aquarium and you are good to go.

Overall Score
4.2


(44 Points)

8. 20 Pieces Digital Temperature Sticker Adhesive Thermometer Strip Aquarium Thermometer Sticker Temper...

User Ratings: 72 9

BBTO First Impressions

"9, and 78."

In the right situation this magnet thermometer is the best available. Bought the two pack of thermometers. Excellent working for our bearded dragon tank. Bought the two pack of thermometers. One of my aquariums is glass, and the other two are plastic. Water tested with Autidefy brand for two hours. The digital display itself is easy to read at a glance.

  • 20 Pieces Digital Temperature Sticker Adhesive Thermometer Strip Aquarium Thermometer Sticker Temperature Thermometer Strips in Degree Fahrenheit and Celsius Display for Fish Tank and Aquarium
  • Package quantity: there are 20 pieces digital temperature sticker in the package, enough quantity to meet your long time using and use for different occasions; The adhesive temperature strip measure approx. 13 x 2 cm/ 5.1 x 0.8 in in length and width, proper size to fit most surfaces
  • Easy to stick: our aquarium thermometer sticker features adhesive design, just peel off the tape and attach to surface of aquarium, fish tank and others; After about 2 to 5 minutes, the colored change will indicate the exact temperature; Please keep it away from any heat source
  • Easy to read: the fish tank thermometer strip has 3 colored marking that can indicate the temperature situation, which can change with the water temperature, each color represents different water temperature condition, they can be seen clearly and quickly from the surface
  • Monitor temperature: our digital temperature sticker is suitable for monitor temperature of fish tank and aquarium, can keep fishes, shrimps, reptiles or turtles comfortable by making sure the water isn't too hot or too cold; Also can be applied to measure the temperature of your DIY drinks and wine barrel, terrarium and any sort of pet tank
  • Measuring range: the stick-on digital temperature strip measures both Fahrenheit and Celsius degree, Celsius degree in the range of 18 to 34 °C, and Fahrenheit degree in the range of 64 to 93 °F
  • Manufacture: BBTO
  • Editor's Impressions Of The BBTO
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

BBTO Final Thoughts

"Love this product!"

A bit large for anything smaller than 5 gallons, but that's to be expected. The plastic from the suction cup quickly turned from a clear to a milky white. 6F all six took about three minutes to read between 88. The only reason I didn't give this 5 stars is because my betta fish didn't like it. The units each had a battery in place and situated for immediate use. The suction will never be the same. I did have a problem with one in my first pack of 6.

Overall Score
4.4


(43 Points)

9. 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
  • Quality
  • Value For Money
  • Affordability

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


(8702 Points)

10. POPETPOP Pet Dog Thermometer Digital - LCD Waterproof Electronic Portable Vetinary Thermometer for D...

User Ratings: 29 22

POPETPOP J17LR51I0OV0P449AW15T0F First Impressions

"I like the product."

Ordered three of these and they do the job. Set all six probes up in a terrarium with a constant temp of 88. At least in the first 3 months of use. My poor fish was in 86 degrees water for a month. If the digital display starts to get dim, it's time for a new battery. They are within a degree or two of other thermometers I've checked to compare them. Since it is a mercury thermometer, it is very accurate.

  • POPETPOP Pet Dog Thermometer Digital - LCD Waterproof Electronic Portable Vetinary Thermometer for Dog Puppy Cats Rabbits Kittens Sheep Celsius Only
  • Animal Thermometer Waterproof rubber probe, flexible, soft tactility more comfortabe.
  • Soft sensor, measurement accuracy, LCD display and waterproof.
  • Suitable for your farm animal, pigs, cattle, sheep, etc.
  • Directions for use: Insert the thermometer soft head position rectal 5-8 cm, press the switch (ON/OFF) button, hear di after start measuring, when they hear continuous di... After the measurement end. 20-40 seconds out thermometer, view the measurement results, according to the switch key to clos
  • Cat temperature thermometer made of high quality ABS material, practical, durable and safe.
  • Manufacture: POPETPOP
  • Product Dimensions: 4.72 x 1.18 x 0.79 inches; 0.71 Ounces
  • Editor's Impressions Of The POPETPOP J17LR51I0OV0P449AW15T0F
  • Thermometer Accuracy
  • Quality
  • Value For Money
  • Affordability

POPETPOP J17LR51I0OV0P449AW15T0F Final Thoughts

"And he is a betta."

Simple fix, you adjust the thermometer within the suction cup and VIOLA! Just BE CAREFUL WHEN ADJUSTING, IT IS GLASS AND WILL BREAK. When I set up my newest tank I will be getting another one of these. Works well in my betta tank, but provide a couple hours for it to read temp changes. So much easier than the ones that hang on the inside. I had my heater set at 73-degrees and the thermometers showed 74. The digital display itself is easy to read at a glance.

Overall Score
3.2


(32 Points)

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