The handheld optical power meter is a fiber optic test instrument. Fiber-optic installations require end-to-end optical loss measurements. The meter can measure eight standard WDM and CWDM wavelengths: 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm, and 1650nm. It has universal ST, FC, and SC interface connectors, making it a very convenient and universal tool.