81525A|Agilent 81525A|HP 81525A

Specifications at a glance for the 81525A:
Wavelength Range: 800 to 1650 nm
Detector Type (Sensor Element): InGaAs
Detector Size (diameter): 5 mm
Power Range: -70 to +23 dBm (800 - 1650 nm)
Wavelength Accuracy (Uncertainty): +/- 3.0% (900 to 1600 nm)
Additional Information

The Agilent optical power heads are specially designed for low PDL, low spectral ripple and high return loss and are used for optical component test. The heads come with a magnetic D-shape adapter and provide a safe stand.
Applicable Fiber Type: Standard Single-mode And Multimode max. 100 um core size, NA < 0.3
Linearity: -50 to +10 dBm
Connector Type Options:
81000FA: FC/PC connector adapter
81000KA: SC/PC connector adapter
81000PA: E-2000 connector adapter
81000VA: ST/PC connector adapter
81003LA : LC/PC connector adapter

The 81525A is a high power InGaAs optical head. Specs: 5mm. +27 to -70 dBm.800 to 1650 nm. It is used with: HP8163A, HP8164A, HP8153A.