Best Seller | Hydrofarm Autopilot Hydroponic Gardening CO2 RH Temperature Monitor & Data Logger | 3.2 H x 4.7 W x 6.2 D in | Wayfair APCEM2 Monitoring stats such as carbon dioxide, temperature, and relative humidity are imperative to growing healthy, strong plants in an indoor gardening system such as a grow room or greenhouse. Help keep those levels in check with the autopilot desktop CO2... more | | $156.22 $122.66 FREE shipping go to store |