Introduction to the ELS-50 Light Source by EXFO Canada:

Offers power stability and reliability suitable for loss testing applications in telecommunications, broadcasting, and FTTH scenarios, available in dual-wavelength and triple-wavelength options.        

Features of the ELS-50 Light Source by EXFO Canada
Robust design
Superior power stability and reliability for loss testing
60 hours of battery life
Replaceable connector adapters
Modulated signal for easy fiber identification
Applications of the ELS-50 Light Source by EXFO Canada

Dual-wavelength and triple-wavelength versions suitable for telecommunications, broadcasting, and FTTx
Single-mode and multimode compatibility for enterprise/LAN use