Fiber optic testers are specialized tools used to evaluate the performance and integrity of fiber optic cables. They help technicians identify issues such as breaks, bends, or poor connections in the cables, ensuring that data transmission remains efficient and reliable. These testers can measure various parameters, including optical power, loss, and reflectance. By providing accurate readings, they assist in troubleshooting and maintaining fiber optic networks, which are essential for high-speed internet and telecommunications services.