This offer includes 1 pc of Chameleon Drop Checker

• Specially-designed to suit a professional's needs
• Made of glass, for maximum reliability
• Easy reading with color chart
• Facilitates the adjustment of the pH level

Drop Checker is an original glassware unit, designed to indicate the CO₂ amount diluted within the water with color change of the pH reagent inside, in order to understand the proper amount of CO₂ supply. You can easily judge the proper CO₂ supply by comparing the color of reagent with pH color test card.

User manual for Chameleon drop checker

1. Get some tap water or distilled water from the grocery store.
2. Fill the drop checker bulb about 2/3 full of the water.
3. Add about 3 drops of pH test reagent, to get a strong blue color, but not so much that the water becomes opaque with the blue dye.
4. Use the suction cup on the "drop checker" to suspend the device two or three inches below the tank water surface, with the "horn" of the "drop checker" pointing downwards. There should be air trapped in the horn. (Refer to picture below)

5. After a couple of hours, the color of the "drop checker" fluid will be at equilibrium color.
   Green color - 30 ppm of CO₂ in the water. Good dose of CO_2.
   Yellow color - More than 70 ppm of CO₂(Dangerous level for fish).
   Blue color - 10 ppm of CO₂, not enough CO₂ for your plants.