I'm looking for a tool that can be used to measure the length of Cat 6 cables that need to be installed in a comms rack. I won't be making the cables myself. For example the length of a cable required between a switch at the bottom of the rack and the patch panel at the top. I could use Visio but it may give me inaccurate results. The lengths of these cables can then be given to a data cabler to install them in the rack. I've come across a couple of tools, http://racktables.org/ and http://flux.org.uk/projects/rackmonkey/ but they don't suit my purpose.