Jonard Tools FLS-55 Single-Mode and Multi-Mode Fiber Optic Light Source

Achieve reliable, repeatable fiber loss testing across single‑mode and multi‑mode links with the Jonard Tools FLS-55 fiber optic light source. Built for technicians and IT teams working on security, surveillance, monitoring, and enterprise networking, this light source delivers stable output at critical wavelengths (850/1300 nm and 1310/1550 nm) so you can trust your optical power loss and relative power loss measurements. The FLS-55 ships with FC, SC and LC adapters to connect quickly to UPC/PC fiber connectors and reduce setup time on the job. Field‑focused features — including a shatter‑resistant sleeve, user‑friendly flush button to prevent dust contamination, and a backlit LCD for low‑light visibility — keep the unit working reliably in demanding environments. Powered by three standard AA alkaline batteries, the compact 14.4 oz design is easy to carry and maintain on site. Whether you’re certifying links for CCTV, access control, or backbone network runs, the Jonard Tools FLS-55 helps you complete tests faster and with greater confidence. Add the FLS-55 to your test kit today to streamline fiber troubleshooting and verification.

• Speeds field testing for single‑mode and multi‑mode networks, reducing troubleshooting time on security, surveillance, and monitoring installations
• Includes FC, SC and LC adapters for instant connections to UPC/PC connectors, minimizing adapter swaps and setup delays
• Stable output at 850/1300 nm and 1310/1550 nm for accurate optical power loss and relative power loss measurements
• Rugged, shatter‑resistant sleeve and flush button protect the emitter and reduce contamination in harsh environments
• Backlit LCD and compact, lightweight design (14.4 oz) for clear readouts and comfortable one‑handed use during night or confined‑space work
• Uses common AA batteries (3× AA) for easy field power replacement and uninterrupted testing workflow