YUSHI VM100 Handheld LED UV NDT Flashlights are mainly used in industrial detection, including Fluorescent Penetrate Testing, Fluorescent Magnetic Particle Flaw Detection and Fluorescent Leak Detection. Other Applications: Oil and Stain detection, special gas, oil and gas pipeline inspection of Special Substances, Criminal investigation and forensic investigation, Paper currency identification, gem appreciation, agriculture, food, medical and other related industries.