DGZZI 10 Sets Pen Style Red Light Sources Repair Parts Metal Nib and 7mm Ceramic Refill Suitable for Optical Fibre Visual Fault Locators

["Product materials: Primarily composed of two materials, ceramic (ceramic core) and metal (metal tip). The ceramic core is fragile.","Product dimensions: Ceramic core 7mm (Please refer to the image for specific product dimensions)","Product features: Features a built-in wear indicator, allowing for quick identification of the ceramic core's wear status. Installation is straightforward and requires no specialist tools, tweezers are sufficient. Red light fault diagnosis allows the ceramic core to be checked first, avoiding unnecessary replacement of the entire pen.","Product application: Suitable for use as a dedicated replacement spare part for various types of optical fibre visual fault locators and optical fibre testers.","Package contents: 10 sets of pen-style red light source repair kits"]