You can do it with a spare ethernet socket and a meter (an electricians meter, not a meter stick!)
just pair up the wires in the socket, make sure you have some order to this as you need to know which pairs contacts to test on the other end!!!
Its what i used anyway, and i did have a broken cable, the whole house has been wired, the cables run through the loft! (and it HAD to be the longest cable didnt it!!!) bah... hope this is good enuf for what you need it for (as all it can test for it broken wires...)