has visual fault location(vfl) dead zone<5m the hightest sampling distinguish ablity 0.25m, 16k real data sampling poit, LCD ST3200 OTDR (Optical Time Domain Reflectometer) is an intelligent optical fiber communication tester. This tester is easy to use and portable, which has a 3.5-inch color LCD touching screen. It also possesses events intelligent analysis and more user—friendly operation. It ...