The Extech VFM200 is a compact, real-time indoor air quality meter that simultaneously measures Total Volatile Organic Compounds (TVOC) and Formaldehyde (HCHO) concentrations. Ideal for homes, offices, schools, hotels, and industrial environments, it detects harmful chemicals from sources like paints, adhesives, cleaning products, and vehicle exhaust. Features include a backlit LCD, dual-unit display (ppm or mg/m³), audible/visual alarms, fast-response fuel cell sensor, and rechargeable battery with universal AC adapter.