Portable air quality monitor adopts electrochemical sensor with stable performance and high detection accuracy, monitoring CO concentration, CO2 concentration, temperature and relative humidity in the air. Large-screen LCD digital display, real-time monitoring, perfect for home, office, school, warehouse, agricultural planting, etc. Features: 4 in 1: Multifunctional air quality detector real-time monitors CO concentration, CO2 concentration, temperature and relative humidity in the air. Large digital screen with backlight, clear and easy to read, support alarm function. High Accuracy: Using electrochemical sensor, plus high-performance chip, detection is more accurate, higher accuracy, and the accuracy can reach 1PPM. Quick Heat Dissipation: With multiple ventilation holes, which accelerate the convection between the air and the detector, to achieve effective detection and provide a nice heat dissipation effect. Built-in Battery: Equipped with 2400mAh high-capacity rechargeable battery, low power consumption and long endurance, no need to replace the battery frequently. Wide Application: Lightweight and portable, it is suitable for home, office, school, warehouse, agricultural planting, etc. No need to calibrate at startup, automatic monitoring. Specifications: Model: PTH-9E Material: ABS Type: Portable Measurement Object: CO, CO2, temperature and humidity Carbon Monoxide Measurement Range: 0-500 ppm (±5% or ±10ppm) Carbon Dioxide Measurement Range: 400~5000 ppm (±5% or ±50ppm) Temperature Measurement Range: 0 -50 (±1.5 ) / 32 -122 (±2.7 ) Humidity Measurement Range: 20%-80% RH (±5% RH) Power Supply: built-in Li-ion Cylindrical battery (3.7V 2400mAh) Input: Type C(5V=1A) Light Indicating Sound Alarm: Green: 0-100PPM, good level Yellow: 101-150PPM, normal Red: above 151-500PPM, adverse level, sound alarm Item Size: 98 * 90 * 40 mm / 3.86 * 3.54 * 1.57 inch Item Weight: 201g / 7.09oz Package Size: 14 * 10 * 5 cm / 5.51 * 3.94 * 1.97 inch Package Weight: 317g / 11.18oz Packing List: 1 * Air Quality Detector 1 * Type-C Cable 1 * User Manual