The installer would have to certify the cable.
Other's can only certify the test results.
Just to test it and give you the results,as I mentioned above is what you are looking to have done it seems.
We do it for $10.00 a cable if you have a small installation and only one person is required.
For larger installations that may require two people,we normally suggest doing it T&M (time and material),which is an hourly rate with documentation sent to you at a small additonal charge.
The hourly rate will vary according to the company you hire,and the location of the site to be tested.
You would also have to keep in mind,that in order to test each station would be taken off the network during the test,so if it requires testing on weekends (which I would suggest),or off shift will involve a shit differential charge.
Remember: Not all test equipment is the same. The better ones would be like the Aligent Wirescope and Fluke. Go to their websites and look at what they do and samples of the results screens, which of course,the print outs would be about the same.
We have a couple of the Wirescope 350's and also test Fiber with them.
Good Luck