Extech VFM200 VOC and Formaldehyde Meter with Alarm is handheld digital meter for real-time measurement of VOC and Formaldehyde concentrations with high-accuracy and fast response time. Extech VFM200 displays measurements in either ppm and mg/m3 on a backlit LCD display, features high and low alarms that are adjustable, and includes a rechargeable battery with charger. The VFM200 reads many different chemicals including: Acetone, Ethylene Glycol, Formaldehyde, Xylene, 1,3-butadiene, Tetrachloroethene, Hydrogen Sulfide, Ammonia, Toluene, Benzene, Methylene Chloride, Perchloroethylene, and MTBE.