The bare fiber adapter offers the possibility to do a quick reflectometry test on an optical cable before installation, when it is still on reel.

Before stripping and cleaving, you just have to introduce each fiber inside and to process the test.
The adapter can be re-used for the next fiber.
If the fiber breaks inside the adapter, you just need to unscrew the module and pull it out.

With such a product, you will clear any doubt on a fiber possible break and avoid any problems after installation.