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Here's another option: http://www.co2meter.com/collections/fixed-wall-mount/products/co2-level-controller Since I work for the company, you should take it with a grain of salt, but they are made in the USA, great support via toll free number and for an extra $79 you can get a USB cable to...

I've read some positive reviews on the Sentinel, and the price you paid is great. Was $100 more a year ago. As to geneticfreak's comment about the ballast: if you're spending some coin anyway, I've read the full spectrum LED bulbs really work (and don't have a ballast)...

The Kronus looks sweet. Good instructions on the website here: http://www.titancontrols.net/products/temperature-and-humidity/kronus-4.aspx Make sure the amps drawn by the CO2 valve and fans are less than the max amps allowed on the 110V plugs, or you'll blow a fuse inside the Kronus. Mark...

What are you looking for? Spot check CO2 levels? Graph CO2 levels over time? Control a CO2 growing system? Unless you're looking at a full-blown CO2 grow system with lights, $700 is way too high. Mark www.co2meter.com

CO2Meter.com makes a CO2 controller with a 250V 10A relay for $199. CAP is popular, but make sure the control relay is rated at a high enough amperage to handle your tankless water heater. You don't want to "smoke" the controller. :-P - Mark

The meter thealien1111 got has CO2, temp and %RH. The one on sale now is CO2 only - that is why it is cheaper. Because this was not clear, if you buy a TIM8 CO2/temp/%RH meter like aliens and put in the code ROLLITUP on checkout your final price will be $179.95 less 20% is $144 - still a...

Check out http://homeharvest.com/carbondioxidemonitorcontrol.htm I've shopped at their Lansing, MI store. They have lots of nice stuff.

The Figaro is inexpensive and will solve your problem. However it is electrochemical, which means it is slower to react and has a 2 year lifespan. For $99 you can get a dual-beam self-calibrating infrared sensor that does the same thing, reacts quickly to changes in CO2, with 15 year...

You'll need to test this. I suggest you find a high school student who is looking for a science fair project ;-) Rollo Indoor Air Quality Monitor

Here's an inexpensive CO2 meter: Indoor Air Quality Monitor $179.95. Self-calibrating, includes wall plug. Also does humidity, temp.

Inexpensive CO2 meter for testing: Indoor Air Quality Monitor $179.95, self-calibrating, includes wall plug.

Check out Indoor Air Quality Monitor $179.95 new. Self-calibrating, includes wall plug.