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Such combination allow optical network builders test their fibers with different wavelengths at the same time. http://en.wikipedia.org/wiki/Optical_power_meter
This model is: PM100 with sensors S120UV(200-1100nm) and S122B
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Current Location: 36-228, 36-228 (There are two meters in the lab)
Vendor: Thorlabs
Manual: Instruction Manual
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