The Extech VFM200 measures VOC and formaldehyde concentrations in real-time for indoor air quality monitoring. Backlit LCD displays both TVOC and HCHO simultaneously. Selectable units (ppm or mg/m³), adjustable audible and visual high/low alarms, auto power off.

TVOC range 0.00-9.99 ppm, formaldehyde range 0.00-5.00 ppm with ±5% FS accuracy and under 2 second response time. Built-in fuel cell formaldehyde sensor for fast, accurate readings. Applications include homes, offices, factories, hotels, schools, and other indoor environments where VOCs from paints, finishes, adhesives, and other sources may be present.