I'm looking to do a sealed room with A/C and CO2. I need a recommendation for a CO2 controller with an actual PPM readout. I'd like it to be able to handle a high enough PPM that I can use it to kill of mites, but I don't think I need any other fancy features for the controller. I also need to know what to look for in a regulator. The local grow shops have regulators for $150, but I'm seeing regulators all over eBay for $50 new. I'm not sure if these will work O.K., or if there are some definitive features to look for like flow rate, etc.
bump bum bump i need to know which controller to buy...i have a titan kronus 4 and would like to run co2 also