This CO2 Drop Checker provides fast, accurate and continuous monitoring of CO2 levels in planted aquariums. Made from high-clarity glass, it blends naturally into the tank while giving you color-based CO2 readings at a glance. The included 4dKH solution ensures reliable measurements—essential for keeping both plants and fish healthy.

Designed for beginners and professionals, this kit helps maintain the ideal CO2 level of 20–40 ppm, promoting lush plant growth and preventing CO2 fluctuations.

Key Features

• Includes Correct Testing Solution
  Comes with 4dKH reference fluid + indicator for accurate CO2 readings.

• Easy to Read Colors

  • Blue → Low CO2

  • Green → Optimal CO2 (ideal 30 ppm)

  • Yellow → Too much CO2

• High-Clarity Glass Design
  Transparent, durable, and blends seamlessly into planted tanks.

• Simple Installation
  Add solution, invert the checker, attach with suction cup, and read levels within ~2 hours.

• Essential for Planted Aquariums
  Helps prevent CO2 deficiency or overdose, ensuring healthy plant growth and safe conditions for fish.

Package Includes

• • 1 × Glass CO2 Drop Checker

  • 1 × Suction Cup

  • 1 × 4dKH Solution