CO2-1 Kit (Hub Base + CO2-1 Hub-Ready Sensor) Everything you need for 24/7 continuous monitoring of CO2, temperature, humidity, and light. Expandable up to 12 Hub-ready sensors. This kit includes: 1x Hub Base 1x CO2-1 Sensor: CO2, Temperature, Relative Humidity, and Light Intensity 1x Backbone Extension Cable (6ft/2m) 1x 3-way T Connector Looking for Hub sensors? Looking for Hub accessories?