Features: Suitable for FC, ST, SC interfaces. Removable and self-replaceable accessories, easy to use. Lightweight and compact, stress-free travel, easy to operate with one hand. Imported laserhead, high thermal conductivity easily penetrates long-distance optical fibers. Aluminum alloy for shell, durable and comfortable, with metal texture on the pen body, more non-slip. Specifications: Material: Metal Size: Approx. 175x26x26 mm/6.89x1.02x1.02 in Package Includes: 1x Red Light Pen Tester 1x Lanyard 1x Pen Pack 2x AA Batteries 1x Manual note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.