1. 9in1 MULTIFUNCTIONAL AIR QUALITY MONITOR and improved indoor air quality monitor that can accurately assess multiple air quality measurements, including concentrations of formaldehyde (HCHO), PM2.5, PM1.0, PM10, HCHO, TVOC, temperature, humidity, AQI, and time display. It is very important for you to know the air quality of your living space. 2. PORTABLE AIR DETECTOR Check indoor air quality anywhere. This lightweight, easytocarry air quality detector can help monitor air quality at home, in the kitchen, bedroom, office, school, car, hotel, while traveling, camping, etc., especially in spaces with babies, children, and pregnant women. 3. EASY TO USE This air monitor is simple to operate—just press the function button. The updated user manual is straightforward and easy to understand. The smart air tester can monitor environmental variations over a period that matters to you. You can take it anywhere to track air quality. At the same time, you can set a standard value for formaldehyde. If the density exceeds the standard value, it will alert you. 4. Testing Technology: Semiconductor sensor 5. Sampling Type: Diffusion type