G222E - If you need to monitor 1 or 2 specific gases, the Micro 5 is the best choice. It can be equipped with either one or two electrochemical sensors, allowing you to reliably detect a variety of toxic gases, oxygen or hydrogen in different measuring ranges. The Micro 5 is approved for use in Ex zone 0. Its small and lightweight, yet still very durable design offers the best possible combination of safety and comfort to anybody carrying it.