Thicker ABS material, the pen body is made of ABS forging, good oxidation resistance and long-lasting use Applicable to various optical fiber interface standard 2.5mm interface, applicable to any interface of FC/ST/SC The light source has strong penetrating power, easily penetrates the red light pen with super stable optical fiber performance In universal, the higher the temperature, the shorter the lasers life, so try to avoid high temperature working environment when using it. The fiber head is cleaned when the lasers is working. When not using the light source, please cover the dust cap to prevent dust from falling into it. FC to LC adapter, suitable for many occasions, optical power meter, lasers light source, red light pen, red light source colour: as shown Material: ABS Package Contents: 1 x Fiber optic cable tester tool (without 2 x AA batteries) 1 x adapter Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.