Features: brand new and high quality 90% of optical fiber connection failures are caused by contamination of the end face of the optical fiber. It is important to ensure that the end face of the optical fiber is clean for network transmission. Dirt or debris that accumulates between the two end faces of the connection can cause permanent damage such as cracks, scratches and dents. It provide fiber optic connector cleaners for fast and effective cleaning of connector end faces, including unused jumper connectors and connectors with adapters inserted. This cleaner can remove dust, oil and other debris on the end face of the casing without damaging or scratching the end face. This fiber cleaner pen comes with a clear window on the side allowing the user to see through to the microfiber tape reel. This will let you know how many of the 800 simplex cleanings are left in your for smart click cleaning pen.Clear Usage Window, A visible micro fiber meter lets you know how many cleaning clicks are left. Use a dry cleaning cloth to replace the solvent requirements. One-touch design, one push, one second cleaning, can clean more than 800 times 1.25mm 2.5mm LC/MU fiber connector. Specifications: Name: Fiber optical cleaning pen Material: Antistatic resin Color: Blue for 1.25mm , white for 2.5mm (optional) Cleaning times: ≥800 times Size: approx. 183x18x18mm/7.20x0.71x0.71in Application: LC/MU 1.25mm 2.5mm fiber optic connector male and female Package Includes: 1PC x Optical Fiber Pen note: Size for manual measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!