The compact FireSting-O2 is a PC-controlled (USB) fiber-optic oxygen meter can be combined with the complete optical oxygen sensor and optical temperature sensor portfolio from PyroScience, ranging from microsensors (50 µm tip) to robust probes (3 mm tip), and including also diverse smart contactless sensor solutions. Most oxygen sensor types are available for the full O2 range and for a lower trace oxygen range (0-10%). Automatic temperature compensation of the oxygen measurements in samples with varying temperatures is possible with an optical temperature sensor connected to an optical channel or with a Pt100 temperature probe connected to the temperature port of the FireSting-O2. With the included user-friendly logger software several meters can be operated within one Pyro Workbench window. The integrated Pyro Data Inspector features multiple functions like drift compensation or calculation of oxygen rates.