Zacro Digital Aquarium Thermometer

Curated from 74 real Reddit conversations

Refreshed on: March 1, 2025

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Zacro Digital Aquarium Thermometer

Brand: Zacro
Price: $8
Snoop Score:
2.3
Sentiment
1.2
Popularity
1.4
Technical
3.3
Buy on Amazon for $8See All Aquarium Thermometers Reviews
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Snoop's Take

The Zacro Digital Aquarium Thermometer is a compact digital device designed to measure water temperature in fish tanks and terrariums. It employs a submersible probe paired with a large LCD display to deliver near-instant, precision readings. User feedback is a mixed bag, with some enthusiasts lauding its clear digital output – one even noted, "i got four digits on my thermometer!" – while a chorus of complaints highlights frustrating inaccuracies and baffling installation quirks. Multiple reviewers warn that the device's readings can be off, urging buyers to cross-check temperatures with alternative tools. Confusion over battery replacement and mounting options further complicates matters. In short, the sentiment is as divided as it is critical. Ultimately, while the clear display and ease of installation earn the thermometer some merit, its questionable measurement accuracy makes it a cautious buy. Experts might pass on it in favor of more reliable models, whereas casual hobbyists may find its simplicity appealing if they double-check the readings.

Not for you? Check out our other rated Aquarium Thermometers

They all work well. Just make sure to get one with probes for an accurate reading.

Positive Feedback

PLEASE buy more than one thermometer (or a really high quality one) to make sure the temperature is actually what it says.

Negative Feedback
Product
2.3
Zacro Digital Aquarium Thermometer
Buy on Amazon for $8
Fish Health Monitoring
2 / 10
Aquarium Maintenance
2 / 10
Easy Installation
2 / 10
Versatile Aquatic Environments
2 / 10
See how this compares to all Aquarium Thermometers

What it does well!

Key strengths users can’t stop talking about.
Reliable performance
“They all work well. Just make sure to get one with probes for an accurate reading.”➕

Where it needs some work!

Areas to watch—feedback on possible improvements.
Inaccurate temperature readings
“PLEASE buy more than one thermometer (or a really high quality one) to make sure the temperature is actually what it says.”➕
“Why is it that all the new ones I’ve bought say closer to 90F?”➕
“This is the answer.”➕
“take a glass and fill it with ice and water temp it it should be 32⁰ plus/minus 1 degree.”➕
Potential damage from improper usage
“NOPE don’t put that in there. You can get a cheap laser temperature gun that doesn’t have to go in the tank.”➕
Confusing mounting mechanism
“good suction cup?”➕

Compare On All Talked About Dimensions

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DaToo Aquarium ThermometerDaToo Aquarium Thermometer$6
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DORHEA 4Pcs Aquarium Thermometer Fish Tank ThermometerDORHEA 4Pcs Aquarium Thermometer Fish Tank Thermometer$7
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QZQ Fish Tank Thermometer Aquarium Thermometer Wireless Touch StickQZQ Fish Tank Thermometer Aquarium Thermometer Wireless Touch Stick$9
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AQUANEAT Aquarium ThermometerAQUANEAT Aquarium Thermometer$3
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JXTZ 2 Pack Digital Aquarium ThermometerJXTZ 2 Pack Digital Aquarium Thermometer$5
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AQUANEAT 2 Pack Aquarium ThermometerAQUANEAT 2 Pack Aquarium Thermometer$7
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JW Aquarium SmartTemp ThermometerJW Aquarium SmartTemp Thermometer$6
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Penn-Plax Therma-Temp Floating Aquarium ThermometerPenn-Plax Therma-Temp Floating Aquarium Thermometer$8
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Zacro Digital Aquarium ThermometerZacro Digital Aquarium Thermometer$8
2.3
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AikTryee 2-Pack Aquarium ThermometerAikTryee 2-Pack Aquarium Thermometer$7
0.9
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Generic Aquarium Thermometer, Fish Tank ThermometerGeneric Aquarium Thermometer, Fish Tank Thermometer$2
0.5
DetailsBuy

Core Power Plays

The specs and strengths that make it shine.
Preference for analog liquid thermometers
“Just buy a regular, non digital old school one.”➕
“A regular old-school liquid thermometer.”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’
Alternative aquarium heating safety measures
“It’s like an extra fail safe.”➕
Confusing product naming
“It shows you the temperature using digits.”➕
“It confusing 🤷🏻‍♂️”➕
Thermometer calibration advice
“Dip each into a glass of ice water and trust whichever is closer to 32f”➕
“Thats not how thermometers work.”➕
“One point is usually good enough but if you want a second point for peace of mind.”➕
“Then calibrate them.”➕
Digital thermometer brand reputation matters
“Govee thermometer hygrometers are super cheap and super accurate.”➕
“I would make sure to buy a reputable brand and you should be ok.”➕
Heater safety and reliability recommendations
“You may not need it with the right heater but better safe than sorry.”➕
“If your heater fails and continues to heat this will stop it from cooking your fishies.”➕
“Have been using no problem.”➕
“A heater is the most dangerous equipment we use in our aquarium.”➕
Proper betta fish care and environment advice
“Its a terrible but common way betta are housed.”➕
“Part of me wonders if they just have no idea what kind needs the Betta has.... so maybe they would change it.”➕
“I recommend the brand zacro.”➕
“Good clean water is the best thing for him.”➕
Essential aquarium equipment tips and water testing recommendations
“Please do yourself a favor by ordering it now.”➕
“You can do this way cheaper, it just takes patience, carefulness and a hardy shrimp species like neos.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.
Fragmented marketplace and quality concerns
“Given the low bar of entry, limited customer expertise, and fragmented marketplace, the aquarium hobby is an easy target for these types of schemes.”➕
Digital thermometer accuracy limitations
“Just because your thermometer is digital does not mean it's accurate.”➕
“Could do a small water change with cold water (add very slowly) as a temporary fix.”➕
“Try replacing the battery of the thermometer or pick up an infrared thermometer gun for about $15 on Amazon.”➕
“Mine always reads 8 degrees low.”➕
Feeder functionality and quality concerns
“I dig it, super quiet and well made.”➕
“Looks like any generic feeder to me.”➕

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