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Title: Good for short runs, but not long runs!
Review: I bought this hoping to identify and label all the CAT5 outlets in my house. The builder neglected to label the wires in the switch panel, so I had no idea what was running to where. I connected the tone source to a jack and used the probe in the panel to try to identify the wire. Unfortunately, the signal was not strong enough / loud enough to be detected in the switch panel. I have a two story house and all the wires go through the walls to the attic and back down into the panel on the ground floor. I was only able to detect 1 jack (an upstairs jack with the shortest run of cable). If you have shorter runs of cable, it may work for you, but it didn't do what I needed.
