Crowcon Calibration Gas 60L 100ppm CO in Air is a key tool for gas detector maintenance. It’s a 60-liter cylinder filled with a precise mix of 100 parts per million carbon monoxide in air. This gas helps ensure Crowcon detectors give accurate CO readings. The long shelf life of this mixture means you can use it for many calibrations. As a result, it’s a cost-effective way to keep your gas detectors working well.