1.9-in-1 multifunctional air quality monitor Key features and benefits Multi-parameter measurements: accurately evaluates formaldehyde (HCHO), PM2.5, PM1.0, PM10, TVOC, temperature, humidity, and AQI; includes appointment time setting. Knowing these values helps you identify pollution sources and decide when to ventilate or use air treatment. Portable and practical: carry the detector for spot checks or leave it running for continuous monitoring. Suitable for use at home, in the kitchen, bedroom, office, school, car, hotel, when traveling or camping. Protects vulnerable people: useful where babies, children, or pregnant women spend time, helping you reduce exposure to formaldehyde, particulate matter, and volatile organic compounds. Easy to operate: single function button and an updated, easy-to-understand instruction manual make setup and daily use straightforward. Monitor the environment over a user-selected period. Formaldehyde threshold setting: you can set a default HCHO value; if measured density exceeds that default, the device indicates the over-limit condition so you can take action. Test technology: semiconductor sensor for reliable detection and fast response to changes in air quality. Performance and usage notes Function: continuous and spot air-quality monitoring with multi-parameter display. Portability: designed for easy transport so you can check indoor air quality wherever you need it. Operation: simple one-button control and clear instructions; supports appointment time for scheduled checks. Practical scenarios Nursery or child’s room: monitor formaldehyde and particulates after assembling new furniture or repainting to protect infants and toddlers. Travel and accommodation: check hotel rooms or rental cars for VOCs and particulate matter before extended stays. Kitchen and living areas: monitor PM and TVOC levels while cooking or during household cleaning to know when ventilation is needed. Technical note Detection method: semiconductor sensor. This monitor offers a straightforward, portable way to track multiple indoor air-quality parameters so you can make informed decisions about ventilation and air treatment.