... 270HZ,330HZ, JW3110 Optical Light Source Features JW3110 Mini optical light source is the most rugged small size instrument in the industry ... the JW3205 mini power meter, it constitutes the smallest optical loss test kit, perfect for field testing Specifications ... )115*60*20Weight (g)110Standard Packages MODELINCLUDESAll JW3116 ModelsJW3116 Optical Light Source, 3pcs 1.5V Batteries, Power Adapter, ...