Best co2 controller monitor for indoor grow room.

I'm setting up a 20x20 room with a 9ft ceiling, airtight sealed.

I picked up a co2 tank and an "Active Air co2 system with programmable timer" from a hydro store. I'm trying to find a simple unit that I can "set and forget" at various PPMs.

What do you think of:

Sentinel CHHC-4

Titan Saturn 6

Titan atlas 7

Titan atlas 4

Any recommendations?

I would love to hear what other people are using. Please share, thanks!

I decided to go with a Titan Saturn 6.

Main reasons for going with the Titan was because its supposed to be among the most accurate & reliable units available. It runs CO2, humidity & temp. It's in my price range and my local hydro shop has a good working relationship with Titan. So I feel my needs will be met with this product/company.

I'll give you guys another review after using this for a while.

I'm going to be running this unit in conjunction with a dehumidifier, inline fan with carbon filter as a recycling cooling/cleaning fan & a Co2 tank in a sealed room. Rockin a 6500k garden in a 20x18ft sealed room with 9ft ceiling. Also got a 3 ton mini split that will only run with lights on.

MRG

great choice! They are awesome