We tested popular wideband O₂ controllers against lab-grade equipment to see how accurate their lambda readings really are ...

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Fingertip monitors known as pulse oximeters that can be used at home to detect low blood oxygen levels (hypoxemia) give ...

The snow burst through the trees with no warning but a last-second whoosh of sound, a two-story wall of white and Chris Rudolph’s piercing cry: “Avalanche! Elyse!” The very thing the 16 skiers and ...