2 in 1 Optical Power Meter and Visual Fault Locator USB Rechargeable Auto Shutdown Fiber Optic Cable Tester 1mw Item Type: Optical Power Meter with VFL Material: ABS Detector Type: InGaAs Applicable Range: Single, Multi Mode Fiber Calibration Wavelength (nm): 850, 1300, 1310, 1490, 1550, 1625 Measurement Range (dBm): -70~+10 Display Units: mW uW nW dBm dB Light Emitting Device: FP LD Operating Wavelength (nm): 650 Output Optical Power Typical Value (mW): >10 Red Light Flashing Frequency: Yes, Frequency is 2Hz Battery: Li Battery x 1 (Built in) Auto Power Off Time: 10 Minutes Continuous Working Time: >200 Hours (Single Optical Power Meter Operation) ≥ 50 Hours (10mW red light source and optical power meter working simultaneously) Optical Interface: Optical Power Meter Module: Interchangeable FC and SC Head Red Light Source Module: 2.5mm Universal Interface Operating Temperature (℃): 10~+50 Accuracy: <±3% (-10dBm, 22℃) Resolution Linearity: 0.1%, Nonlinearity: 0.01dBm