|They also make fiber optic testers, but these are usually expensive.|
We have two testers where I work. They are capable of testing both copper and fibre. Not only do they test, they certify as well.
I've tested many many cables with them and will be testing some more in the next month or so after we finish renovating our library. My coworker and I will be pulling, terminating and testing all our cables ourselves.
The expensive one is worth around $10,000.00 brand new and the less expensive one is around $1,500.00