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Combined with ergonomic design, it is mini and compact, simple to operate, easy to carry, and equipped with light-emitting diodes for status indication. It can be used for visual testing of optical fibers, optical cables, and connectors. When the tested optical fiber has a breakpoint, the laser light transmitting along the optical fiber will leak red light at the breakpoint, and the visible light can determine the position of the breakpoint. The effect depends on the fiber protective layer and the color of the cover.

Organizing Upgrade is an attempt to engage left leaders and innovators in the field of community organizing in a strategic dialogue.  We hope that this project can bring the kind of inspiration, vision and strategic clarity we need to strengthen our political impact, both in our immediate fight and in our longer-term efforts to build the social justice movement and to revitalize a movement-rooted left in the United States.  We hope that, by encouraging some of the leading innovators and leaders from the sphere of community organizing to put pen to paper and to speak their mind, we can develop unity and clarity about the key demands on left organizers in these times.