What co2 monitor do you use ?

I'm looking into a new co2 monitor and cannot decide which to buy. Some of these monitors can be upward of 700.00 , thats fucking crazy ! Can any of you recommend a good one. ! thanks !

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