I missed the part where it says it measures CO2 directly not through pH. hmmmm...it calibrates via atmospheric CO2. Does this use a probe intended for air CO2 ppm testing? Does this work in water? Air quality/CO2 meters are in this price range.
Please report back...i'm a little more curious now that I saw it measures CO2 directly. I would compare it to other methods of indirectly measuring CO2 like the pH/KH chart and see how well they align.
I have seen this on another forum. It looks cool, I just don't like the fact that is has to sit on top of the tank. It's a built in controller so that's a bonus too, it'll control your solenoid for you. Equipment like this, and other hobby grade co2 meters, will take a lot of the guess work out of co2 for planted aquariums and make it easier to keep much healthier and more beautiful plants.