A CO2 probe is a device used to measure the concentration of carbon dioxide (CO2) in the atmosphere. It is typically used in industrial settings to monitor the levels of CO2 in the air, as high levels of CO2 can be dangerous to workers. The device works by measuring the electrical resistance of the air, which is affected by the amount of CO2 present. The device then sends a signal to a controller, which can be used to alert workers when the CO2 levels become too high. The CO2 probe is an important tool for ensuring the safety of workers in industrial settings, as it can detect dangerous levels of CO2 before they become a hazard.