This is a quality air quality detector with a compact, lightweight, and portable design. It features high-accuracy temperature and humidity sensors for real-time detection, automatic data refresh, and self-calibration with multiple uses. The large LCD display allows clear viewing of battery level, CO2 value, TVOC value, HCHO value, temperature, and humidity. Applications include agricultural planning, greenhouse vegetables, production warehouses, material processing, home environments, business offices, and more. Features: - Compact size, lightweight, and easy to carry - High-accuracy temperature and humidity sensors with strong interference resistance, stable performance, and low power consumption - Large backlit LCD display; backlight can be turned off or switched as needed - Real-time detection and automatic data refresh - Built-in calibration function: press and hold the calibration button for 5 seconds to reset and clear data for accurate re-measurement - Max data viewing function: press the "MAX" button to view the highest recorded values in the current test session - Air quality level indication with three distinct levels for clear understanding of current air conditions - Ventilation holes on the housing enhance air exchange, support effective detection, and provide efficient heat dissipation Specifications: - Name: Air Quality Detector - Material: ABS - Sensors: Digital temperature and humidity sensors - Display: LCD with backlight - Battery: 1 x built-in lithium battery, 3.7V, 1000mAh (included) - CO2 measurement range: 385 ppm ~ 2000 ppm - TVOC measurement range: 0.000 mg/m³ ~ 2.000 mg/m³ - HCHO measurement range: 0.000 mg/m³ ~ 1.000 mg/m³ - Temperature measurement range: 0°C ~ 90.0°C (32°F ~ 194°F) - Humidity measurement range: 0% ~ 90% RH - Item size: 177 x 79 x 40 mm - Item weight: 191 g - Package size: 201 x 112 x 38 mm - Package weight: 220 g Packing List: - 1 x Air Quality Detector - 1 x Cable - 1 x User Manual