Greenhouse Controller (complete) $593.55 Greenhouse Controller (extreme) $1,017.55 Green Air CO2 Generator model CD-6 $534.95 Adjustable Recycling Timer 3-120 Minutes $104.95 Adjustable Recycling Timer 12-480 Minutes $104.95 Day Photocontroller 120v $72.95 Night Photocontroller 120v $72.95 Sunleaves Digital Hygro-Thermometer small $19.95 Sunleaves Digital Hygro-Thermometer large $24.95