... fiber optic project and maintenance OBox RS6201 series Handheld Optical Power Meter are versatile power measurement instruments. RS6201 can offers eight calibrated points: 650nm ... Display screen.RS6201 series include the following three types of Optical Power Meter, which divided by different measuring range.TypeRS6201ARS6201BRS6201CDetectorSiliconInGaAsWavelengths650,780,850,980 ...