... Dead zone mode: this mode is suitable for testing optical fiber with short distance and the optimized settings of distance range ... be guaranteed less than -40dB.Specifications:MODULE2101Wavelength1310nm/1550nm ±20nmApplicable Fiber Dynamic Range128/26dBDistance Measurement Accuracy±(1m + sample space + ... 2, 4, 8, 16mDistance Range0.5,1,2,4, 8, 16, 32, 64, 128, 256kmPulse width10, 30, 80, 160, 320 ...