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LCD Digital Aquarium Thermometer
Our Digital Thermometer features an easy to read digital display with temperature in either Fahrenheit or Celsius depending on your choice. The thermometer is accurate enough to create readings within 1 degree. Looking for a Thermometer for your Fish Tank? Our Digital Thermometer is a good choice for you!
Small Volume
Its size shows as the picture:
Thermometer size: 2.17 x 1.46 in
Cable length: 24.88 in
Probe: 1.57 in
Battery
Each fisch tank thermometer is equipped with a LR44 battery. Open the battery cover and insert battery with (+) positive side up. The LCD will now display the current room temperature.
Operation
1. Attach the display unit to the outside of the tank using the suction cups and submerge the probe into the water in the tank.
2. Press and hold the power (PWR) button to turn on. Hold the power button for 3 seconds to turn off.
Rumbatech
2025-08-13 14:08:10
I've had these less than 12 hours but they seem to be working perfectly. I have a huge fish tank with Bettas outside the glass sliding door in the living room. We love to watch them at night, but with the cold weather we have been having here in South Florida I put some foam insulation on the tank to prevent heat loss on the sides, and back. The bottom, top and front were still exposed, so I got an electric blanket to cover the top and front to prevent heat loss, and I stuck an Aiicioo 24 watt 18 x 8 inch Under Tank Heater pad to the bottom. I wanted to raise the electric blanket off the front so that we could watch the Betta and his 7 newborn 'kids', but I was hesitant because I wasn't sure how fast the cold weather would pull away the heat. I also have two immersion heaters in the tank, but with such a large tank I had doubts as to their performance in this cold weather. I placed the probe of one of the thermometers all the way to the bottom and got about 62 degrees Fahrenheit. I then placed the probe of the second thermometer near the surface, just over 12 inches from the immersion heaters and got 89 degrees Fahrenheit. I found it strange that the temperature at the bottom was so low, so I checked the Lutron app on my phone and saw that the switch for the heating pad was off. That was around 1:00pm, so I turned the heating pad on and left it. Around 7:00pm when we came back from shopping I took this picture and the surface temperature had dropped to 87.9 degrees and the bottom temperature had risen to 72.2 degrees, and this is with the front exposed. This is exactly what I needed the thermometers for. Knowing that the temperature would continue to fall during the night, I turned the electric blanket on to prevent heat loss from the top of the tank. As you can see in the picture, papa Betta(I gave mama away because she was eating her hatch-lings) is sitting between the two immersion heaters, even though the surface temperature is at the higher limit of his comfort zone. Bettas tend to reside at the surface so I'm not too worried about the temperature at depth, nevertheless I'd like the bottom temperature to hit 76. The funny thing is that the babies don't seem to mind zipping around in the colder water at the bottom, but they tend to stick mostly from mid-level to surface. These thermometers will allow me to properly monitor the temperatures and only turn on the electric blanket when it is absolutely needed. It's true the thermometers don't have a back light, but light uses up a lot of power, and for the few seconds I'll be looking at the thermometers, I can use the light on my cell phone. Wonderful and simple product and I love that each one comes with two good suction pads. You can't complain at this price.
RemMag
2025-08-10 17:10:13
The simplicity of these thermometers is nice, with a switch to choose between F & C, and a nice size easy to read digital display. I have only been using these for the last few hours and when I first installed them in a 55 gallon aquarium that is about 3/4 full they were reading within 1 degree of each other at opposite ends of the aquarium (about 4 feet apart). After just a few short hours they were reading the exact same temperature which is nice to see because it shows they are most likely calibrated the same and that the water in the tank is the same temp at both ends considering the heater is on the back side of the tank directly across from one of these thermometers.So far these thermometers are performing well. The suction cups are clinging to the sides of the tank rather nicely. The display unit attaches easily to the suction cup and can be removed really easy if you ever need to change the battery. Yes the battery cover is on the back at one of the ends, but this isn't an issue with how easy it is to remove the cover and install the battery. After using these for a longer period of time, I will update my review.Pros: both units showing same temp in a large tank on opposite ends of the tank, ease of use, installation, simplicity, display screenCons: nothing yet
Cassidy Lee
2025-07-21 10:42:55
I’ve had these for a while and they still work great!!!!! Never had to change the battery. They are easy to use and accurate. I have one on each side of my 125 turtle tank!They don’t have a backlight so they are hard to read when it’s dark, but if you have the room lights on they are easy to read.Giving a 4/5 cause the suction cups don’t work at all for me! I just leave the wires dangling in the corner of the tank unsecured.Also, the wires are really long so you’ll probably have to bunch them up above the tank.
ROC
2025-06-19 14:23:02
Works great. Very simple to operate and install. Would buy again!!!
Robert M
2025-06-06 13:49:10
These are nice thermometers for an aquarium and inexpensive. Their small size allows you to easily hide them if you want them out of sight.
Munchkin
2025-05-30 16:16:22
Easy to set up. I am using it for what it was not designed for so any issues is my doing. I put in container of water with 2 different thermometers and the guages were different from each other. In the aquarium world that could be a big issue (+/- 0.5 deg. F). I'm using mine in poultry world so again the difference in temp not an issue. I think what I need is not what this was made for but overall IF I had and an aquarium I would definately consider this.
your local caveman
2025-05-22 15:36:13
Small. Accurate. Me admire simple functions. Me not get confused. Two buttons. One less than me have brain cell. Me use one machine for fish tank. Other for water change. Work well. Ungh.Me measure air too. Machine measure well. Measure tiny change in temperature. Me cheer simple machine on as air hit 107.5 F. Me disintegrating into pile of vaguely caveman shaped ash but me impressed. Ough.
hunt
2025-03-22 15:21:35
So I got them to be counter test to the temp on my auto tabk heater.Using the 2 of them , the tabk heater read out, and certified digital probe and , a mercury I found that one of the digital in the box was within. 3 of true. The other was 1.2 off.I was good with that as the price is stupid cheap. But now .One got water on it. Didn't work for a week. Not it works and is 4 offThe other fell into the tank. Sunk 6 inches down before I could grab it and works just fine..I have mixed feelings as it is the one that was 1.2 off hahah ....Anyways they did what I needed and helped me confirm my heater on my reef was working and accurate.Money well spent for what I needed and would be good to use to most other things that don't require perfect readings
Subba
2025-03-12 16:27:01
Not accurate. It shows a difference of over 1.3 degree centigrade.
Jorge Castillo
2025-03-07 15:47:36
Buen producto para saber la temperatura del acuario y poder regularla me gusto
Jordy moon
2025-02-02 10:09:37
Suction seems fine on the inside, but does slip out from the display, display seems to be fairly accurate, within about 1°F! Super easy to read and switch between C and F. The power button doesn’t seem to work, so if you want to shut it off you do have to take out the little battery, but I’ve had it on constantly since I put the battery in and it doesn’t seem to be dying yet!
Peru
2025-01-18 18:23:19
I am using these thermometers for a long time in my 2 aquarium, it gives me perfect temperature readings.. the design is excellent small but durable…
Miracle
2024-12-29 18:19:13
Been using this for several months now on my 2ft tank and small shrimp cube it has massively helped me keep a consistent temp great battery life the stickiness isn't the best but abit of water on before putting on the tank really helps
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