Measuring method for optical fiber hole insert

A method of measuring an optical fiber hole insert, the method comprising:

• providing an apparatus comprising a main body and a cover plate, the main body comprising a front side surface, a back side surface and a support surface, the front side surface and the back side surface located at opposite sides of the main body, the support surface interconnected between the front side surface and the back side surface, a plurality of first grooves formed in the support surface and exposed at the front side surface, a plurality of second grooves formed in the support surface and exposed at the back side surface, and a through hole defined in the support surface between the plurality of first grooves and the plurality of second grooves, the first grooves aligned with the respective second grooves, the first and second grooves communicating with the through hole, a distance between the front and back side surfaces being less than a length of the optical fiber insert;
• placing the optical fiber hole insert in one first groove and a corresponding second groove with both opposite ends of the optical fiber hole insert located outside the main body;
• closing the cover plate on the main body to cover the support surface and come into contact with the optical fiber hole insert, thereby fixing the optical fiber hole insert in the first and second grooves;
• and
• measuring the optical fiber hole insert.