Features： 1、650NM RED LIGHTING: The detector will emit 650nm bright red lighting for fiber tracking, broken or fault will refract light and form bright light around the fault area. 2、STABLE LIGHT SOURCE: The detector with stable light source can easily and accurately detect and locate fiber breakage, poor connection, bending or cracking. 3、WIDE RANGE: Optical fiber cable tester can measure 850 980 1300 1310 1490 1550 1625nm other 7 wavelength optical absolute power, with the test range of ‑70dBm to +10dBm. 4、2.5MM UNIVERSAL INTERFACE: The connector of the detector is specially designed for ST, SC, FC interfaces, more convenient for operation. 5、LONG BATTERY LIFE: The fiber optic cable tester can work for 40 hours and then automatically shut down. Specification： Item Type: Optical Power Meter Material: ABS Model: DXL 50D Power Measurement Range: -70 to +10dBm Probe Type: InGaAs Wavelength Range: 850-1625nm Standard Wavelength (nm): 850 980 1300 1310 1490 1550 1625 Display Resolution: Linear Display: 0.1dBm Logarithmic Display: 0.01dBm Working Temperature (℃): -10℃ to +60℃ Storage Temperature (℃): -25℃ to +70℃ Automatic Shutdown Time (Min): Not less than 40 hours Output Optical Power of Red Lighting Pen: 650nm Battery: AA x 2 (shipped without battery) Package List： 1 x SC Head 1 x Optical Power Meter 1 x User Manual