Support 7 Wavelength Testing:It can measure 850/980/1300/1310/1490/1550/1625nm;Measurement Range (dBm): -70dBm to +10dBm. Self Calibration:At the same time,press the +LIGHT key to erter the school.Quasi-mode,the screen letter"dBm" is not displayed.Press ZERO to save and exit calibration mode.The screen letter "dBm" is redisplayed. The handheld optical power meter is a compact and an easy-to-use testing instrument for optical fiber networks, which can be used for absolute optical power measurements as well as for relative loss measurements in optical fibers. Versatile Interface Design - The interface is applicably designed for SC, FC;Display Resolution: Linear Display 0.1%; Logarithmic display 0.01dB It is portable and easy to bring with large screen and LED backlight;External protective cover more Item: Optical power meter Test accuracy: 0.2dB Connector: FC/PC and SC/PC Emitter Type: InGaAs Auto Power-off: Yes Back-light: Yes Operating Temperature: -10 to +50 Celsius Storage Temperature: -20 to +70 Celsius Fiber Power Meter Tester Function Features: Finding the breakpoint, poor connections, bending or cracking in fiber optic cables. Linear Display (mW) and Logarithmic display (dBm) show on the same screen. 2.5mm universal connector, support FC/SC/ interface and quick switch. Finding the faults of OTDR. Operates either in CW or Pulsed. Constant output power. Lower Battery warning. Self calibration Backlight available Colour:grey Material:plastic Package Contents: 1 x Fiber Cable Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.