This is an interesting gizmo that can be used for lots of things but for me it is not going to be an affordable option. It is not a stand alone item to plug in. It needs several other things before we can stick it in to measure the CO2 in tanks. Those other items will run the price way beyond the level most will pay. With mounts, power supply and connections, I see at least $200. With equipment to read concentrations in water rather than air as this is designed it will be out of my range for sure.
Yeah but compared to ph controller ( not accurate) or a scientific water co2 sensor, it's a steal.
The price is closer to $130 I think.