Aquarium CO₂ Glass Drop Checker

  • Accurate 4dKH CO₂ Monitoring:Glass CO₂ drop checker paired with reliable 4dKH solution for stable and consistent readings
  • Easy to Use:Add 15–20 drops of solution, attach to the glass, and allow about one hour for accurate results
  • Clear Color Indicator:Blue = Low CO₂,Green = Optimal,Yellow = Too Much CO₂
  • Complete Kit:Includes glass drop checker, 15ml 4dKH/pH solution, and suction cup
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$13.90 $15.90
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Product Description

The FZONE Aquarium CO₂ Glass Drop Checker is designed to help hobbyists monitor and maintain optimal CO₂ levels in planted aquariums. Its clear glass design allows easy observation of color changes, providing a simple and reliable method to track CO₂ concentration and ensure healthy plant growth.

Made from high-quality, durable glass, this drop checker is resistant to wear and corrosion, making it suitable for long-term use in both freshwater and saltwater tanks. The compact design allows for easy placement in any tank without disrupting the aquascape.

Customer reviews
Customer reviews
Size and shape is perfect, the reagent works well too. Suction cup that comes with it works good. The bottle of reagent will last a long time, it says to replace every 30 days. Im really happy with this CO2 drop checker.
— Rick Deckard
Customer reviews
Very nice. Well made, and the included reagent works like a charm. Great value as always from Fzone!
— Tim Parks
Customer reviews
I love the value of the FZONE Aquatic CO2 Glass Drop Checker, the package comes with the drop checker solution which is great! My setup is mostly ADA (tank, light, aqua soil, lily pipes) except the CO2 drop checker which to me was kind of expensive ($65 including the solution). I went with a different brand and the sucker cup was not strong and caused a mess when the checker fell to the tank bottom. The sucker cup comes with FZONE is strong and works well. Not long after I set it up, the blue solution changed to green which was what I would expect.
— DT