The RP 450 Optical Power Meter measures optical power on fiber optic networks operating at 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1611nm, and 1625nm. These easy-to-use optical power meters provide absolute dBm or dB loss measurements on all optical networks. The RP 450 allows the user to set the incoming signal to a “zero” reference and provide direct loss measurements.