21- 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. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Voltage: AC220V Flow: Range: 0 to 10.0 L/min Input: 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: 02 Machine output only Resolution: 0.1 % Accuracy: ± 1.5% Pressure: Range: 0-100Kpa Resolution: 1Kpa Accuracy: ±1% 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 Material: ABS Color as shown Package Contents: 1 x Oxygen Analyzer 1 x European plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.