Permanent direct measurement of CO₂and pH
- A special indicator instead of aquarium water permits direct measurement of the CO₂level in mg/l. 20-25 mg/l CO₂is ideal.
- Replace the indicator only every 3-4 weeks, lasts a total of 9-12 months.
- Indicates the pH value (6.4-7.8) in addition to the CO₂level.
