AT8100 Portable Digital Oxygen Concentration Detector 025％ Smart Sensor Handheld O Monitor Tester Meter Condition: Item Type: Oxygen concentration detector Material: ABS Color: As pictures shown Detection Gas: Oxygen Test Range: 0-25% Accuracy: 0.10% Basic Error: ≤±1.5% Temperature Range: -10℃-50℃ Humidity Range: 1%RH-99%RH Response Time: ≤15 seconds Recovery Time: ≤15 seconds Sensor Principle: Electrochemical principle, 2 years lifespan Display: Large screen segmented LCD display Alarm: Sound and light dual alarm. The alarm value and alarm sound can be set separately. Power: 3.7V rechargeable 1000mAh lithium battery(included) Working Time: >90 hours continuous work Working Temperature: -10℃-50℃ Working Humidity: 0-95%RH (non-condensing)