Finding the right co2 controller : I know it's been asked a million times

Hey guys I am upgrading my room to a completely sealed system and was wondering what the best controller for co2 is going to be for my situation:

I will be controlling my temperature and humidity separately (with a minisplit and dehuey), so all I need is a co2 sensor/ controller that will work well with the 20 lb tank and regulator I have.

I have been looking at the cap ppm2, ppm3 and ppm4, seems like people have hit and miss experiences with these....

Has anyone tried out the igs-061 ?

Thanks guys

I got the cap ppm4 hooked up to my 20lb tank. It works good. It's plugged into my sentinel evc2 environmental controller. I like the set up.