Nothing matches all of those filters.
The full range
CO2 for grow rooms
Lifting CO2 above the roughly 400ppm in normal air lets plants photosynthesise faster, but only once everything else is already right: full light intensity, temperature towards the top of the range, and a room that actually holds the gas. In a tent on constant extraction the CO2 is out of the door before the canopy sees it, which is why enrichment belongs in a sealed or largely sealed room, or at least on a controller that pauses extraction while it doses.
There are three ways to get the gas in and they scale differently. Bottled CO2 through the Pro-Leaf CO2 Regulator is the controllable route, a solenoid valve on a cylinder opened and closed on demand. The Mother Nature CO2 Generator produces gas in the room from refills instead of a cylinder, which saves the trip to a gas supplier. AirBomz cans are the smallest step of all, a metered aerosol release for a single tent with no plumbing at all.
Dosing blind wastes gas, so pair the supply with a sensor. The Pro-Leaf CO2 Controller holds a set point anywhere between 400 and 2000ppm, and if you already run a Dimlux Maxi Controller the matching CO2 sensor feeds the same brain that handles your lights and climate. For sealing a room properly see air conditioning. Free UK delivery over £60. Call 020 3488 0419 if you are not sure your room is tight enough to bother.