Rugged, waterproof First Defender offers in-the-field identification of unknown solids and liquids. Optical system uses high-resolution Raman spectroscopy to identify toxic chemicals, explosives, chemical warfare agents, and narcotics. Handheld unit weighs less than 3 lbs. with battery. Offers library with thousands of unique substance signatures. Sampling requires no contact or preparation. Operates through glass bottles and plastic bags without opening them. Identifies chemicals in aqueous solutions. Also identifies individual components of mixtures. Takes first measurement in just 15 secs. Works in temperatures ranging from 20 C. to 40 C. Battery runs 5 hrs.