With a CO2 bubble counter you can easily monitor how much CO2 is added to your tank. Moreover, a CO2 bubble counter is very useful when you fine-tune your CO2 supplying system.
CO2 bubble counters are made of various materials. CO2 bubble counters made of glass look very attractive in an aquascape. On the other hand, CO2 bubble counters made of plastic are much more robust.
A suitable CO2 bubble counter that can withstand high pressures is crucial if you use inline atomisers or CO2 supplying systems that need an elevated pressure level to work well.