accurate and steady Size :1.2X15 cm Weight :20g Material : copper Irradiation distance: 0.01-100 meter Battery: AAA IR laser test pen As one of the most advanced Anti-Counterfeit test tools available in the world now, Infrared Laser Test Pen is used for testing securities, brand, currency, certificates etc. on the specific area of their surface. Quite different from UV fluorescence authentication ...