Features:  Compact in size, lightweight and portable, easy to take out and carry around with you.  Uses high accuracy temperature and humidity sensors, with fine interference resistance ability, stable working performance, with low power consumption.  Large LCD display with backlight, you can see the electricity quantity, CO2 value, TVOC value, HCHO value, temperature, and humidity clearly, and the backlight can be turned off.  ℃ and ℉ switchable, real-time detection, automatic refresh data, with multi-use.  Equipped with calibration button, press it for 5 seconds, the air quality data cleared after re-set, accurate detection.  With max data viewing function, you can press the "MAX" button to view the max data in the current test record.  Equipped with air quality level division function, 3 different words correspond to different air quality levels, allowing you to more accurately and more graphic know the current air conditions.  Hundreds of ventilation holes reserved on the housing not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a fine heat dissipation effect.  Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, business offices, and etc..    Specifications:  Name: Air Quality Detector   Material: ABS  Sensors: digital T/H sensors  Display: LCD display with backlight  Battery: 1 * built-in lithium battery, 3.7V, 1000mAh (included)  CO2 measuring ranges: 350-2000ppm  TVOC measuring ranges: 0.000mg/m³-2.000mg/m³  HCHO measuring ranges: 0.000mg/m³-1.000mg/m³  Temperature measurement ranges: 0℃ to 90℃/ 32℉-194℉  Humidity measurement ranges: 0-99%RH  Item size: 177 * 79 * 40mm / 6.97 * 3.11 * 1.57in  Item weight: 191g / 6.74ounce  Package size: 201 * 112 * 38mm / 7.91 * 4.41 * 1.50in  Package weight: 220g / 7.76ounce    Packing List:  1 * Air Quality Detector  1 * Type-C Cable  1 * Guideline