Display relative optical power. 

Comes with VFL function. 

Low power reminder.

Test sensitivity -40dBm to 10dBm.

Test online without interruption of the ink. 

Recognize the signal of 270Hz, 1KHZ,2KHz. 

LED display, 4 fixtures support bare fiber, 0.9mm,2mm, 3mm fiber. 

Comes with a hood to provide more accurate test results outdoors.

Identify the propagation direction of light, sound alarm reminder.