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, ;Display Resolution: Linear Display 0.1%; Logarithmic display 0.01dBIt is portable and easy to bring with large screen and LED backlight;External protective cover make it more durableItem: Optical power meterTest accuracy: 0.2dBConnector: /PC and SC/PCEmitter Type: InGaAsAuto Power-off: YesBack-light: YesOperating Temperature: -10 to +50 CelsiusStorage Temperature: -20 to +70 CelsiusFiber 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 /SC/ST interface and quick switch.Finding the faults of OTDR.Operates either in CW or Pulsed.Constant output power.Lower Battery warning.Self calibrationBacklight availableColour:greyMaterial:plasticPackage Contents:1 x Fiber Cable TesterOnly 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.