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Useful air quality detector with quick response and high precision to test CO2 content in the air that surrounds you, and real-time display time, date, temperature and relative humidity. Features: Data Logging Function: with up to 65,534 groups maximum storage management space, convenient for browsing the historical data saved by the system. Semiconductor Sensing Detection Technology: monitoring air quality in your surrounding with highly accuracy, real-time detect CO2, temperature and relative humidity. Simple Stylish Appearance: the air quality monitor has small size and clean design, perfect fit for house with any decorative style. Free-standing style, no mounting required. Specifications: Material: ABS Voltage: 5V, 1A Detection Technique: Semiconductor sensing technology Test Function: CO2, temperature & humidity CO2 Test Range: 400~4000ppm Temperature Test Range: -9~55℃ Humidity Test Range: 0~100% Working Condition: -9℃~55℃,