1,Ergonomic Design: Aluminum alloy body with non slip handle, comfortable in hand. Ergonomic design, compact and portable, easy to pick up with one hand. Replaceable ceramic tube core, more convenient to use. 2,Three Interfaces: Support three interfaces to meet different needs, with standard 5mm universal connector, can support FC interface, SC interface, ST interface. 4,Integrated Chip: This test pen uses a powerful light source integrated chip, integrating power management, signal modulation and switch control. 5,Steady Performance: The performance of this tester is very stable, with a stable output power, which means that it can improve the efficiency of the user. 3,Open Cover Type Pen Tip: Our test pen comes with a protection cover and uses an open cover type pen tip to prevent the head from getting damaged by dust. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.