Power Meter with a chip microcomputer control and the large-screen graphics ... (dB)±0.02Display resolution(dB)0.01Frequency ID(Hz)270,330,1K,2KWave ID(nm)1310,1490,1550,1625Date storage capacity1000Communication ... *90*45(250g)Standard Packages MODELINCLUDESAll 3506 ModelsS3506 Optical Power Meter, 3pcs 1.5V batteries, AC Adaptor, User Manual, Cotton swabs ...