21-100% with 0.1% resolution Ultrasonic oxygen sensor with accuracy ≤±1.5% Battery Lasts >24 hours. Comes with a rechargeable Li-ion 1000mAh and wall plug charger. Made with strong ABS plastic housing. Comes with two barb inlets for easy connection. The Oxygen Analyzer is specially used for detecting the concentration of O2 generated by molecular sieve O2 Concentrator. The oxygen measurement we offer has high sensitivity. Due to stable quality, our instrument can last over 5 years. Flow: Range:: 0 to 10.0 L/min Input:: PSA 02 Machine output only Resolution: 0.1 L/min Accuracy:: ± 5% F.S. (± 0.2 L/min.) Concentration: Range: 21% to 95.6% O2 Input: PSA 02 Machine output only Resolution: 0.1 % Accuracy: ± 1.5% Pressure: Range: 0-100Kpa Resolution: 1Kpa Accuracy: ±1%FS Temperature: Display: +5°C to +55°C LCD power supply Battery: 12V 1A3000mAh Weight: 300g Length: 17.6 cm Length Including Inlet Fittings: Thickness: 3.5 cm