Cal Aqua Labs Double Check 2 CO2 Checker

Cal Aqua Labs' "Double Check" series is the only all-glass dual-compartment CO₂ checker that allows the user to accurately compare the CO₂ level in your aquarium side-by-side against a standard reference.  The top chamber holds the CO₂ indicator solution, whereas the bottom chamber carries a CO₂ reference solution. The reference solution color corresponds to 30 ppm of CO₂ - a level that is widely accepted for good plant growth in most aquariums.

Features:

• Unique dual-compartment design. Top compartment holds the Indicator solution, while the bottom compartment holds the Reference solution
• No solution preparation needed. Required solutions are premade and included
• Improved durability and ease of use
• Easy to fill and remove solutions from both chambers
• Simple to use, simple to read, higher accuracy than other single-compartment checkers

Package includes:

• 1 Double-Check 2 CO₂ checker
• 1 x 15ml Reference solution, calibrated to 30ppm CO₂
• 1 x 15ml Indicator solution
• 1 suction cup
• 2 Reference chamber plugs
• Use instructions

Approximate size without suction cup: 2"x1.5" (HxW)