... , 270HZ,330HZ, JW3111 optical light source Features JW3111 optical light source Is a handheld optical light source, newly released in 2007. ... to satisfy specific requirements including the 650nm visible light source and the 1310/1550nm wavelengths for single ... 1000*50Weight (g)370Standard Packages MODELINCLUDESAll JW3116 ModelsJW3116 Optical Light Source, 3pcs 1.5V Batteries, Power Adapter, User Manual ...