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ISTA CO₂ Indicator I‑690 – All Angle CO₂ Level Indicator for Planted Aquariums
The ISTA CO₂ Indicator I‑690 is a CO₂ level indicator designed to provide continuous visual feedback on dissolved carbon dioxide in planted aquariums. It allows hobbyists to quickly check whether CO₂ dosing is within the optimal range, helping to support plant growth and overall aquarium health.
Made from high‑quality transparent acrylic, this indicator features a view‑from‑all‑angles design that prevents spills of the indicator solution and includes a reusable colour chart sticker for easy interpretation.
Key Benefits
✔️ Continuous visual CO₂ level monitoring
✔️ Easy‑to‑read colour indication system
✔️ All‑angle viewing design
✔️ Safe, anti‑spill construction
✔️ Reusable solution and colour chart included
Features
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Model I‑690 / All Angle View
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Clear acrylic construction
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Includes CO₂ indicator solution and colour chart
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Suction cup mounting for aquarium glass
How It Works
Fill the indicator with the included solution and submerge it in your aquarium. The fluid changes colour based on CO₂ levels:
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Blue – Low CO₂
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Green – Ideal CO₂
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Yellow – High CO₂
(Colour variation may occur due to lighting and tank depth.)
Usage Instructions
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Add the provided indicator solution into the indicator unit.
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Attach the indicator to the aquarium wall with the included suction cup.
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Stick the colour chart on the outside of the glass.
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Compare the indicator colour to the chart to monitor CO₂ levels.
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Change the solution approximately every 2–4 weeks to maintain accuracy.