Features: 1.Support SC and FC interfaces, simultaneous display of linear (mW) and nonlinear indicators (dB), background light on/off, user self?calibration, wavelength memory function and other functions. 2.Optical power detector is controlled by a single?chip microprocessor with complete functions, and it also uses built?in detectors and lasers, which means they can be protected well in it. 3.The design of the fuselage conforms to the requirements of ergonomics, adopts advanced cold plastic molding technology, beautiful and durable, you can use it for a long time. 4.The optical power meter has a compact shape, easy to carry, can be automatically shut down, can be manually calibrated, fiber optic work identification, and a wide test range. 5.The cable tester is widely used in optical cable construction and maintenance, optical fiber communication, optical fiber sensing, optical CATV and other fields. specification:Item Type: Cable Tester Material: ABS Wavelength Range: 8001700nm Connector: FC/SC Probe Type: InGaAs Power Measurement Range: -70~+6dB or -50~+26dB Uncertainty: 5% Standard Wavelength (nm): 850, 1300, 1310, 1490, 1550, 1625 Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBm Battery Type: 3 x AA Battery(Delivered Without Battery) Application Scope: Widely Used in Optical Cable Construction and Maintenance, Optical Fiber Communication, Optical Fiber Sensing, Optical CATV and Other Fields Calibration Function Description Press the "LIGHT+ Keys at the Same Time to Enter the User Mode, and the Letters CAL"Are Displayed in the Lower Right Corner of the Screen. the Following Functions Are Effective After the Combination of Keys is Pressed. Function Button Remarks Increase by 0.05dB dB *1.01158 Reduce 0.05dB LIGHT *0.99855 Save ZERO Short Press (store to Flash) Switching Wavelength Restore Factory Settings +ZERO Displays FAC and Reads the Default Value into the Array at the Same Time. PackageList:1 x Cable Tester 1 x SC Connector 1 x User Manual NoteDelivered without battery.