⚛️ DETECT: Our oxygen analyzer never needs calibration. Detection range: 21 - 100% with 0.1% resolution. Comes FACTORY-CALIBRATED. 🌷 ACCURATE: The ultrasonic oxygen sensor has a lifespan of > 5 years. 🎆 BATTERY: Lasts > 24 hours. Comes with a rechargeable Li-ion 1000 mAh and wall plug charger. Large digital screen with battery status. 💪 STRONG: Constructed with strong ABS plastic housing. Comes with two barb inlets for easy connection to your oxygen concentrator. 🕵️ TRUSTWORTHY: ** 1-year limited warranty ** Product tested and verified in the USA **, Weight: 0.6 pounds, Manufacturer: Forensics Detectors