For most power meter measurements, the following equipment is required:

Optical power meter:

• With proper wavelengths

• With proper connectors

• For single-mode or multimode fiber sizes

• Calibrated in dBm, preferably with optional dB scale

• Accuracy to at least ±0.1 dB

Optical light source:

• With stable light source

• With proper wavelengths (same as operating equipment)

• With proper connectors

• With single-mode or multimode fiber sizes

• With proper source, laser or LED source

• With sufficient output light power

Test patch cords:

• At least two, 1 to 5 m in length

• High quality with known loss (tested at factory and results documented)

• With proper connectors

• With same core size as fiber optic facility to be tested Adapter:

• Good quality with ceramic sleeves

• Proper connector fitting

• Two required

Connector/adapter cleaning kit

Related links:
Optical power loss (attenuation) in fiber access – types, values and sources
Optical Power Loss measurement in db – how to measure it fast and correct – tutorial
Fiber Optical Patchcords / Pigtails