Hang this glass CO₂ drop checker over the rim so the bulb sits underwater. The indicator solution changes color as it responds to dissolved CO₂.
Fit and connections
- Mount Hangs on the aquarium rim
- Indicator Glass bulb used with CO₂ drop checker solution
Use CO₂ drop checker solution and read the color against its chart. The color responds with a delay. Give it time to settle after changing the CO₂ setting.
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