Fluke networks sfsinglemode2 single mode 1490 1625 laser light source fluke networks sfsinglemode2 p the fluke networks sfsinglemode2 is a single mode 1490 1625 laser light source with st and lc testing capability the sfsinglemode2 can troubleshoot optical fibre cabling systems measure loss and power levels and inspect and clean connector end faces p p the sfsinglemode2 will verify continuity and polarity and provide assistance to find breaks and bends in cables and locate problems i