Product overview A compact, accuracy air quality meter that uses a professional electrochemical sensing module and a digital temperature and humidity sensor. Designed for stable performance, strong antiinterference capability, low power consumption, and long service life. The large LCD clearly displays battery level, CO2, TVOC, HCHO, temperature, and humidity for quick, reliable readings. Key benefits Accurate multiparameter detection: Monitors CO2, TVOC, HCHO, temperature, and humidity to give a clear picture of indoor air quality. Reliable sensing and stable performance: Professional electrochemical sensing module and digital sensors provide consistent, lownoise measurements. Long runtime and low power use: Builtin 3.7 V 1800 mAh lithium battery supports extended use and can be recharged via the included USB cable. Easy to read and use: Large LCD shows all values and battery status. Alarm sound and display judgment help you respond quickly to poor air quality. Practical safeguard: A 30minute automatic ON/OFF function prevents the product from being discharged; this automatic function can be canceled manually. Main features Professional electrochemical sensing module for accuracy and stability. Digital temperature and humidity sensor for precise environmental readings. Large LCD display showing battery level, CO2, TVOC, HCHO, temperature, and humidity. Low battery indicator: the battery frame flashes when battery is too low to prompt recharging. Switchable alarm sound: alarm can be turned on or off according to preference. Environmental quality judgment: displays an appropriate level based on measured values to help interpret results. 30minute automatic ON/OFF default function; to cancel this feature press the + and buttons at the same time until you hear two beeps. This helps ensure the device is with charge. Specifications Name: Air Quality Meter Material: plastics Display: LCD display Battery: 1 builtin lithium battery, 3.7 V, 1800 mAh (included) CO2 measuring range: 350 to 2000 ppm TVOC measuring range: 0.000 to 2.000 per m3 HCHO measuring range: 0.000 to 1.000 per m3 Temperature range: 0 to 90.0 C (32 to 194 F), accuracy +/1 Item size: 176 x 73 x 29 mm (6.93 x 2.87 x 1.14 in) Packing list 1 x Air Quality Meter 1 x USB Cable Use scenarios Home monitoring: Place the meter in living rooms, bedrooms, or kitchens to track CO2 and volatile compounds and improve ventilation decisions. Workplace and classroom checks: Assess indoor air quality in offices, meeting rooms, and classrooms to maintain comfortable conditions. HVAC and maintenance: Use during inspections or when troubleshooting ventilation and filtration systems to identify sources of poor air quality. What you get A portable, easytoread air quality meter with multiparameter detection, rechargeable battery, and practical functions that help you monitor indoor air conditions and respond when levels require attention.