Replacement CO2 Tube (10/pak but sold individually)
Replacement CO2 Tube (10/pak but sold individually) at HorticultureSource.com -
Replacement CO2 Tube (10/pak) (eco-5572) CO 2 Test Replacement Tubes CO2 Test Replacement Tubes are available in a pack of 10 tubes. Each gas detection tube measures from 300 - 5000 PPM of CO 2 . This item is sold individually. Manufacturer's Product Information MSRP $ 3.5