Features Transmitter Testing Function including cable continuity testing cable scan port flashing cable length measurement PoE test QC testing for crystal head OPM optical power meter and VFL visual fault location function POE Test automatic identification of midspan endspan power by 8 cores automatic identification of standard and nonstandard device Optical Power Meter 850 1300 1310 1490 1550 1625nm wavelength switching unit switching at dBm dB or mw uw nw and REF switch Visual Fault Location Function detect and locate fiber breaks as well as problems such as poor connections fiber bends or cracks Receiver Function sensitivity adjustment 300m no load shielded network cable non empty shielded network cable NCV detection lighting function etc Non contact Voltage Detecting the receiver can be used to detect the AC voltage of household electrical wiring Illuminate Function the receiver designed with lamp for auxiliary lighting up the working areas during operation Battery Operated both the transmitter and the receiver are built in with 1500mAh polymer battery no need to change batteries type C charging with charging indicator and low battery indicator Other Settings backlight brightness level 1 2 3 backlight time MAX 1min 30S 15S auto off time 15min 30min 1h 2h off red light flash under VFL function fast flashing slow flashing ON Wide Applications suitable for the network line engineering and maintenance work of telecommunication compute