Additional Features:  Built-in test applications 10 pm wavelength accuracy Fast dual-sweep method Covers S, C, and L wavelength bands  The Agilent HP 86140B maintains most of the higher performance characteristics of the 86142B/86145B models while providing measurement solutions at value prices. With the Keysight Agilent HP 86140B you can quickly, easily and accurately characterize 50 GHz and wider WDM systems, optical sources and broadband components with its enhanced marker functionality, integrated power measurement capability and fast sweep speed.