● All-metal fuselage,CNC highly processed ● 4 kinds of chucks. Easy to operate and change; ● Suitable for 0.25/0.9/2.0/3.0mm fiber ● Recognizable 2kHz, 1kHz, 270Hz signal type with beeping sound ● Identify dominant signal direction ● Universal single-mode multi-mode fiber ● Simple and practical operation ● LED display,uniform light, show clear