Language 
Display relative optical power.
Test online without interruption of the link.
Recognize the signal of 270Hz,1KHZ,2KHz.
Comes with a hood to provide more accurate test results outdoors.
ldentify the propagation direction of light,sound alarm reminder.
Comes with VFL function
LED display，4 fixtures support bare fber,0.9mm,2mm, 3mm fiber.
Low power reminder.
Test sensitivity -40dBm to 10dBm.
Phone: 
