PATIKIL 20-Pack 5mm Ceramic Cores For Visual Fault Locator – Replacement Fiber Optic Tester Sleeves, 3.6mm Diameter

About This Product

If you're working with fiber optic testers or red light pens, these ceramic core inserts are a handy replacement part to keep around.

Each one measures 5mm long with a 3.

6mm diameter, and you get 20 in the pack—so you've got plenty of spares for maintenance or quick swaps.

They're made from quality ceramic material, which means they're durable and resistant to breakage.

That's important because the ceramic part is what actually interfaces with the fiber, and if it cracks, your testing can go wonky.

These are built to last and give you consistent performance over time.

Plus, they've got an improved design that makes them easier to install than older-style cores—no wrestling with tiny parts or risk of damaging your equipment.

These fit most standard fiber cable testers and red light pens, so they're super versatile.

Just be gentle when you install—don't force them or use excessive pressure, and they'll serve you well.
Good value for a small but essential accessory.