Features 1、Will realize one‑key temperature switching, more convenient and reliable to use. 2、Can respond quickly to oxygen, and the alarm level can be manually set by light and sound. 3、Using high‑quality sensors, with good sensitivity and excellent repeatability, short response time, accurate and professional measurement. 4、The color display shows clearer readings, reliable and bringing you much convenience. 5、Suitable for family, agriculture, chemical industry, general industry and laboratory, etc. Specification Condition: 100% brand new 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) Package List 1 x Oxygen Test Meter 1 x USB Data Cable 1 x Lithium Battery 1 x Lanyard 1 x Cloth Bag 1 x Manual