The Fluval CO2 Indicator set is used to monitor approximate CO2 levels and also helps gauge CO2 levels in aquariums.
The kit includes :
10 mL (0.34 fl oz) CO2 Indicator Solution
Color reference sticker to gauge CO2 levels
High Quality, Break Resistant Quartz?Glass Construction Fully Submersible Simple Installation Available In A Variety Of Sizes Suction Cups For Securing To The Aquarium Visible Temperature Setting For Use In Fresh...