Transmitter test function: including cable continuity test, cable scan, port flashing, cable length measurement, PoE test, QC test for crystal head, OPM (optical power meter) and VFL (visual fault location) function. POE test: automatic identification of midspan/endspan/power through 8 cores, automatic identification of standard and non-standard devices. Optical power meter: 850/1300/1310/1490/1550/1625 nm wavelength switching; unit switching at dBm, dB or mw, uw, nw; and REF switch.Non-contact voltage detection: the receiver can be used to detect the AC voltage of household electrical wiring. Visual fault location function: Detect and locate fibre breaks as well as problems such as bad connections, fibre bends or cracks. Receiver function: sensitivity adjustment, 300 m unloaded shielded network cable / non-empty shielded network cable, NCV detection, illumination function, etc. Features: Other settings: Backlight brightness (level 1/2/3), backlight time (MAX/1 min/30 sec/15 sec), auto-off time (15 min/30 min/1 hr/2 hr/off), red light flash under VFL function (fast flash/slow flash/ON). Wide applications: suitable for network wiring and maintenance work of telecommunication, computer, other metal conductors, etc.