The EXFO PX1 Optical Power Expert is an essential device in today’s field toolkit to measure the optical signal power (dBm) or link loss (dB). With the PX1 save field test results on the device and share reports through your smartphone a . Leverage the mobile app to simplify your workflow and test results management, while also receiving field updates that enable new features. The EXFO PX1 enables technicians to close more jobs, better and more efficiently through industry-leading features such as bundled wavelengths or instant boot up for use on the go.