Extech VFM200 VOC and Formaldehyde Real Time Meter is a compactly-designed and fast-responding portable meter for determining VOC and Formaldehyde concentrations in real-time. Extech VFM200 has a backlit screen that displays measurements in both ppm and mg/m3, has adjustable high and low alarms, and comes complete with rechargeable battery and charger. The Extech VFM200 measures a wide array of compounds including: Acetone, Ethylene Glycol, Formaldehyde, Xylene, 1,3-butadiene, Tetrachloroethene, Hydrogen Sulfide, Ammonia, Toluene, Benzene, Methylene Chloride, Perchloroethylene, and MTBE.