Portable Air Quality Monitor Experience the convenience and precision of our Portable Air Quality Monitor, featuring an electrochemical sensor that delivers stable performance and high detection accuracy. Effortlessly monitor carbon monoxide (CO) and carbon dioxide (CO2) levels, temperature, and relative humidity in the air. This device is perfect for use in homes, offices, schools, warehouses, and agricultural settings. Features: 4-in-1 Monitoring: Our multifunctional air quality detector provides real-time readings of CO and CO2 concentrations, temperature, and humidity. The large digital screen with a backlight ensures clear visibility and is enhanced with an alarm function for safety alerts. High Accuracy: Equipped with a high-performance chip and an electrochemical sensor, the monitor ensures precise readings with an accuracy reaching up to 1PPM. Efficient Heat Dissipation: Designed with multiple ventilation holes to enhance air convection, enabling effective detection and efficient heat dissipation. Long-Lasting Battery: The built-in 2400mAh rechargeable battery offers low power consumption and extended use, reducing the need for frequent recharging. Versatile Application: Lightweight and portable, this monitor requires no calibration at startup and is ideal for various settings including homes, offices, schools, warehouses, and more. 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 x 90 x 40 mm / 3.86 x 3.54 x 1.57 inch Item Weight: 201g / 7.09oz Package Size: 14 x 10 x 5 cm / 5.51 x 3.94 x 1.97 inch Package Weight: 317g / 11.18oz Packing List: 1 x Air Quality Detector 1 x Type-C Cable 1 x User Manual