Senter OTDR ST3203 optical time domain reflectometer has hand-held design, lightweight, visible laser source, point-to-point optimization, wavelength configurations, full coverage of short-haul OTDR test applications, pass/fail status option, test given event type, event dead zone less than 5m, attenuation dead zone less than 10m, USB-based OTDR, large data storage and 650nm visible light output.