Darn dude... I'm just bumping, cause I have no idea....

CO2 tester... for the air? I guess... Um... can't you just turn it ON and get a reading? Why do you need a solution to read your CO2 levels?

Let's see if we're illuminated by some other people here on these boards...
turtle420 Reviewed by turtle420 on . HELP ME PLEASE!!!!!! Using this system Caddy Turn Key System http://www.sunlightsheds.com/cool_cab.htm Using a 17gal tank to hold the water. Using Rapid Rooter Natural Plant Starter for growcubes. Also using Hydroton Clay Pebbles. For nutrients using EcoGrow "L" 5-0-3 (npk) (part A) & EcoGrow "L" 3-4-5 (npk) (part B). Also have Supernatural Excellofizz http://www.ecogrow.com/index.cfm/product/639/mid/16/nid/0/home.html Also using Hydrofarm CO2 digital Tester. Genesis Solutions Standard Solution Total Dissolved Rating: 5