The KI2600-H6-APC from Kingfisher International is a Optical Power Meter with Measurement Range(Power) -47 to 33 dBm, Wavelength Range 800 to 1700 nm (Response wavelength), Calibrated Wavelength 1310 to 1610 nm, Linearity 0.04 dB (Mid-range linearity), Resolution 0.01 dB. More details for KI2600-H6-APC can be seen below.