Aquarium
Acrylic CO2 Drop Checker Kit for Aquarium Monitoring
4.6/ 5
- 5 9
- 4 3
- 3 1
- 2 0
- 1 0
Brand Pawfly
Product review
Complete monitoring kit: The package contains one tear-shaped acrylic drop checker, a bottle of reagent solution formulated for CO2 indication, and two suction cups with clip mounts for secure attachment.
Design and dimensions: The checker is made of thick, ultra-clear acrylic to resist deformation and deliver easy color comparison. The vial is compact — roughly 4.5 cm tall and about 2.5 cm at its widest point — so it fits neatly inside most aquariums without obstructing the view.
How to use: Add 15 drops of the provided reagent into the chamber, seal the opening, and attach the unit to the inside tank wall with a suction cup. Mount it vertically with the pointed end facing upward. Allow a few hours for the reagent to equilibrate with tank CO2 and observe the color.
Interpreting results: Match the reagent color to the reference bead at the top of the checker. Green or light green indicates an appropriate CO2 concentration for planted tanks, yellow signals excessively high CO2, and blue shows CO2 is too low. Replace the reagent roughly every month for the most reliable response.
Build and reliability: Constructed from resilient acrylic, the indicator resists cracking during normal use and remains clear for straightforward color reading. The included suction cups have clips to hold the unit firmly in place; for unusual glass types or surfaces a softer replacement cup can be used if needed.
Pros
- Complete kit with reagent and mounting hardware
- Durable, clear acrylic for easy color reading
- Compact size fits most planted aquariums
Cons
- Reagent transfer into the chamber can be fiddly
- Suction cup performance varies by surface
- Requires monthly reagent replacements
VerdictA straightforward CO2 monitoring solution for hobbyists and pros running planted tanks. The kit contains everything needed to monitor dissolved CO2: a clear acrylic drop checker, reagent solution, and two suction cups with clips. It provides quick visual feedback—green for balanced levels, yellow for too high, and blue for too low—and is easy to reposition. The acrylic construction resists crackin
Reviews
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Viviana 5/5
Handy for watching CO2 levels
This indicator vial lets you monitor CO2 in a planted aquarium. It includes the reagent and suction cups, and its compact shape keeps it steady during tank maintenance.
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Jacob Simmons 4/5
Works but filling was awkward
Performs perfectly, but the fluid refused to flow into the chamber by pouring. I ended up using a pipette to transfer the reagent and it worked fine afterward.
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Orlando Ulep 5/5
Solidly built
Nicely made, feels sturdy and clear.
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Kindle Customer 5/5
Fast arrival
Delivered quickly and operates as expected.
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Ryan 5/5
Turns invisible chemistry into something you can read
I set this up in a planted tank with a betta and a CO2 system. Filling and mounting was simple, and within hours the reagent reached a green that let me tweak my dosing instead of guessing. My daughter checks it every morning like a tiny experiment. Plants look more vigorous and the fish are fine—this little vial removed a lot of uncertainty.
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Ellie 5/5
Does exactly what's expected
Easy to install and the indicator reacts quickly to CO2 changes. I bought more for other tanks — simple and dependable.
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Alexander Folger 5/5
Compact and attractive
Slim profile, looks good on the glass and the color shifts are easy to see.
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Marco Gtz 4/5
Good CO2 indicator
Had some initial trouble because the packaging lacked clear directions, but once set up it worked well.
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Jose Martinez 5/5
Does the job
A simple device that performs as intended.
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Danyr 4/5
Visible and dependable in the tank
Very clear and noticeable underwater. Sturdy unit and good value.
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Vincent Wight 5/5
A must-have for planted tanks
Shows CO2 status clearly so I’m no longer guessing. Plants are happier and the fish are safe.
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T. Jennings 3/5
Needed a softer suction cup
Unit functioned fine but the supplied suction cup was too rigid to adhere. Swapped it for a softer cup and it stayed put.
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ReviewStu 5/5
Clear readings, reliable mount here
Colors are easy to read. Suction cup held securely for me; the acrylic is high quality and the size is convenient.
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