... .Adjustable outputaa power 3.Tone generation, 270HZ,330HZ, Adjustable Light Source Testing Instrument Features Multi wavelength outputl Adjustable outputl power Tone generation ... *90*44.5Weight (g)231Standard Packages MODELINCLUDESAll JW3116 ModelsJW3116 Optical Light Source, 3pcs 1.5V Batteries, Power Adapter, User Manual, , Cotton ...