Red light emitting patch pen uses 650 nm semiconductor to emit stable red light. The single-mode optical interface is connected in multi-mode and optical fibers, optical fibers of default function detection. Fiber break, bending break position; OTDR dead zone fault checking; End-to-end optical recognition; Mechanical optimization of connection points. Optical engineering, network maintenance, optical fiber functions are indispensable production and research tools. Features: CW and MOD modes. FC, SC, ST interface. Detection distance. Stable power output Nanotechnology Multiple electrostatic protection Function: Fiber breakage, bending breakage position.< /p> OTDR dead zone fault checking. End-to-end optical recognition. Mechanical optimization of connection points. < b>Application: CATV Telecommunications, engineering and maintenance. Construction and maintenance of integrated cables. Production and research of opticians. Other optical engineering. Specification Wavelength: 650 nm Output power: 10 mW Connector: 2.5 mm general connector (SC / FC / ST) Frequency: 1 Hz Power: 1 .5 V AA (not included in the package) Operating temperature: -10 to 45 Range: 10 km Dimension: 17.5 * 2.6cm Weight: 160g Package includes: 1 x Visual Fault Locator