Ista 2in1 CO2 Bubble Counter

The Ista 2in1 bubble counter and check valve is a great bubble counter which provides accurate bubble counting to measure how much Co2 is being put into your aquarium. Not only that but it comes with an included check valve to prevent the aquarium water going back down the line into your Co2 canister. This bubble counter is a clean design allowing for it to fit in to most aquarium systems neatly.