... range makes RS6201 powerful enough to optical fiber CATV systems, optical fiber communications networks maintenance and test.RS6201 ... series include the following three types of Optical Power Meter, which divided by different measuring range.TypeRS6201ARS6201BRS6201CDetectorSiliconInGaAsWavelengths650 ... ,780,850,980,1060nm850,980,1310,1490,1550nmOptical Power Range+3~-70dBm or+10~-70dBm(Optional)+26 ...