Which measurement device is the best choice, depends on what and how precise testing is needed; what is the application and the amount of installations. The simplest way of testing is to use a light source and a power meter. For to determine the exact location of an error you will need an Optical Time-Domain Reflectometer, OTDR.
Our Customer Service is happy to help you and tell you more about our devices: Tel. +35820 478 8600 E-mail: firstname.lastname@example.org