Vaporized hydrogen peroxide is an ecological bio-decontamination agent that decomposes into water and oxygen, leaving no residue. This has led to its widespread use in several bio-decontamination processes. As a leading developer of measurement instruments for demanding environments, we set out to create the best possible technology for measuring those processes. The repeatable measurement in rooms, isolators, transfer hatches, vapor generators or other equipment makes passing regulatory audits easier giving reliable results even in high humidity near condensation.