... include the following three types of Optical Power Meter, which divided by different measuring range.TypeRS6201ARS6201BRS6201CDetectorSiliconInGaAsWavelengths650,780 ... 980,1310,1490,1550nmOptical Power Range+3~-70dBm or+10~-70dBm(Optional)+26~-50dBmUncertainty±5%Resolution0. ... , ST)InterfaceRS232(Optional)Power Supply8.4V Battery or DC12V AdapterBattery Operating Period20h minOperating Temperature-10°C ...