The HTO9-CP250 Fiber Optic Cleaner Pen is a high-performance cleaning tool tailored for SC, ST, FC, and E2000 connectors with 2. Its advanced design ensures effective removal of contaminants from ferrule end faces, maintaining optimal signal transmission. Clean fiber optical connectors Adopting a. Chemtronics is the industry leader for fiber optic cleaning products, providing performance, convenience, time savings and cost savings. Cleaning fiber optic connectors is fast, easy and reliable with our highly engineered solvents, lint-free swabs, precision wipes, and cleaning platforms. Low cost per clean with over 500 cleanings in one unit.