Additional Features: Two-channel, Plug-In System High Measurement Accuracy Ensures Accuracy Over the Entire Range of Power and Wavelength Three Types of High-Sensitivity Sensors Noise Level : -94 dBm High Power Input Optical Sensor (Q82227) Maximum Input Power : +27 dBm Low Polarization Dependency Optical Sensors (Q82232, Q82233) : 0.003 dBp-p or less Sensors with Less Reflection and High-Return-Loss Adapter with Minimum Reflection Large-Diameter (5-mmf) Optical Sensor (Q82216). Collective Measurement for Tape Fibers with up to 12 Cores High Resolution Measurement. Display 0.001 dB/0.0001 dB GPIB Output High-Speed, High-Throughput Measurement. Max. 100 Times/Second Recording Function, PDL Measurement Function The Q8221 uses a two-channel, plug-in system. Various types of optical sensors and light sources are available as plug-in units. The two channels can be used either independently or simultaneously. The Q8221 can handle a variety of applicationsby using the desired combination of optical sensors and light sources.