Luna Smart Ring Gen 2 review: this Oura ring alternative has great battery life and sleep analytics

Announced at IFA 2025, the Luna Smart Ring Gen 2 is the second generation that tracks your biomarkers, and helps you ...
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How Accurate Are Wideband O2 Sensors? A Real-World Lambda Comparison Test

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